diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index b9895b46624..1983f4837a4 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -361,8 +361,9 @@
     </PossiblyUndefinedIntArrayOffset>
   </file>
   <file src="src/Psalm/Type/Reconciler.php">
-    <PossiblyUndefinedIntArrayOffset occurrences="1">
+    <PossiblyUndefinedIntArrayOffset occurrences="2">
       <code>$type[0]</code>
+      <code>$type[0][0]</code>
     </PossiblyUndefinedIntArrayOffset>
   </file>
   <file src="vendor/nikic/php-parser/lib/PhpParser/Node/Expr/ArrowFunction.php">
diff --git a/src/Psalm/Internal/Analyzer/AlgebraAnalyzer.php b/src/Psalm/Internal/Analyzer/AlgebraAnalyzer.php
index 813513decb4..7521d71f30d 100644
--- a/src/Psalm/Internal/Analyzer/AlgebraAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/AlgebraAnalyzer.php
@@ -68,7 +68,7 @@ public static function checkForParadox(
                     new RedundantCondition(
                         $formula_2_clause . ' has already been asserted',
                         new CodeLocation($statements_analyzer, $stmt),
-                        null
+                        'already asserted ' . $formula_2_clause
                     ),
                     $statements_analyzer->getSuppressedIssues()
                 );
diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php b/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
index 5c3d8ec96ef..f5723f47918 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
@@ -3124,7 +3124,7 @@ private static function getEmptyArrayEqualityAssertions(
                         new DocblockTypeContradiction(
                             $var_type . ' does not contain an empty array',
                             new CodeLocation($source, $conditional),
-                            null
+                            $var_type . ' !== []'
                         ),
                         $source->getSuppressedIssues()
                     );
@@ -3133,7 +3133,7 @@ private static function getEmptyArrayEqualityAssertions(
                         new TypeDoesNotContainType(
                             $var_type . ' does not contain empty array',
                             new CodeLocation($source, $conditional),
-                            null
+                            $var_type . ' !== []'
                         ),
                         $source->getSuppressedIssues()
                     );
diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/BinaryOpAnalyzer.php b/src/Psalm/Internal/Analyzer/Statements/Expression/BinaryOpAnalyzer.php
index 5a4108c0127..667583344e9 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/BinaryOpAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/BinaryOpAnalyzer.php
@@ -292,7 +292,7 @@ public static function analyze(
                                             new DocblockTypeContradiction(
                                                 $atomic_right_type . ' string length is not ' . $string_length,
                                                 new CodeLocation($statements_analyzer, $stmt),
-                                                null
+                                                "strlen($atomic_right_type) !== $string_length"
                                             ),
                                             $statements_analyzer->getSuppressedIssues()
                                         );
@@ -301,7 +301,7 @@ public static function analyze(
                                             new TypeDoesNotContainType(
                                                 $atomic_right_type . ' string length is not ' . $string_length,
                                                 new CodeLocation($statements_analyzer, $stmt),
-                                                null
+                                                "strlen($atomic_right_type) !== $string_length"
                                             ),
                                             $statements_analyzer->getSuppressedIssues()
                                         );
@@ -312,7 +312,7 @@ public static function analyze(
                                             new RedundantConditionGivenDocblockType(
                                                 $atomic_right_type . ' string length is never ' . $string_length,
                                                 new CodeLocation($statements_analyzer, $stmt),
-                                                null
+                                                "strlen($atomic_right_type) !== $string_length"
                                             ),
                                             $statements_analyzer->getSuppressedIssues()
                                         );
@@ -321,7 +321,7 @@ public static function analyze(
                                             new RedundantCondition(
                                                 $atomic_right_type . ' string length is never ' . $string_length,
                                                 new CodeLocation($statements_analyzer, $stmt),
-                                                null
+                                                "strlen($atomic_right_type) !== $string_length"
                                             ),
                                             $statements_analyzer->getSuppressedIssues()
                                         );
diff --git a/src/Psalm/Internal/LanguageServer/Server/TextDocument.php b/src/Psalm/Internal/LanguageServer/Server/TextDocument.php
index 8b5b92013bf..45bad8145c0 100644
--- a/src/Psalm/Internal/LanguageServer/Server/TextDocument.php
+++ b/src/Psalm/Internal/LanguageServer/Server/TextDocument.php
@@ -408,8 +408,6 @@ public function codeAction(TextDocumentIdentifier $textDocument, Range $range):
                  * https://github.com/felixfbecker/php-language-server-protocol
                  * See:
                  * https://microsoft.github.io/language-server-protocol/specifications/specification-3-17/#workspaceEdit
-                 *
-                 * @psalm-suppress InvalidArgument
                  */
                 $edit = new WorkspaceEdit([
                     $textDocument->uri => [
diff --git a/src/Psalm/Internal/Type/AssertionReconciler.php b/src/Psalm/Internal/Type/AssertionReconciler.php
index 7c9c53adccd..4e583f43365 100644
--- a/src/Psalm/Internal/Type/AssertionReconciler.php
+++ b/src/Psalm/Internal/Type/AssertionReconciler.php
@@ -1526,7 +1526,7 @@ private static function handleIsA(
                     new TypeDoesNotContainType(
                         'Cannot allow string comparison to object for ' . $key,
                         $code_location,
-                        null
+                        "no string comparison to $key"
                     ),
                     $suppressed_issues
                 );
diff --git a/src/Psalm/Internal/Type/SimpleNegatedAssertionReconciler.php b/src/Psalm/Internal/Type/SimpleNegatedAssertionReconciler.php
index 68b45b1f9b9..ff1b3dcdfad 100644
--- a/src/Psalm/Internal/Type/SimpleNegatedAssertionReconciler.php
+++ b/src/Psalm/Internal/Type/SimpleNegatedAssertionReconciler.php
@@ -125,7 +125,7 @@ public static function reconcile(
                                 'Cannot resolve types for ' . $key . ' with docblock-defined type '
                                     . $existing_var_type . ' and !isset assertion',
                                 $code_location,
-                                null
+                                'cannot resolve !isset '.$existing_var_type. ' ' . $key
                             ),
                             $suppressed_issues
                         );
@@ -135,7 +135,7 @@ public static function reconcile(
                                 'Cannot resolve types for ' . $key . ' with type '
                                     . $existing_var_type . ' and !isset assertion',
                                 $code_location,
-                                null
+                                'cannot resolve !isset '.$existing_var_type. ' ' . $key
                             ),
                             $suppressed_issues
                         );
diff --git a/src/Psalm/IssueBuffer.php b/src/Psalm/IssueBuffer.php
index a89f053792b..94f38c4a357 100644
--- a/src/Psalm/IssueBuffer.php
+++ b/src/Psalm/IssueBuffer.php
@@ -293,7 +293,7 @@ public static function add(CodeIssue $e, bool $is_fixable = false): bool
             . $trace_var
             . '-' . $e->getShortLocation()
             . ':' . $e->code_location->getColumn()
-            . ' ' . $e->dupe_key;
+            . ' ' . ($e->dupe_key ?? $e->message);
 
         if ($reporting_level === Config::REPORT_INFO) {
             if ($is_tainted || !self::alreadyEmitted($emitted_key)) {
@@ -518,7 +518,7 @@ public static function addIssues(array $issues_data): void
                     . '-' . $issue->file_name
                     . ':' . $issue->line_from
                     . ':' . $issue->column_from
-                    . ' ' . $issue->dupe_key;
+                    . ' ' . ($issue->dupe_key ?? $issue->message);
 
                 if (!self::alreadyEmitted($emitted_key)) {
                     self::$issues_data[$file_path][] = $issue;