Auto-translate - Thread Exception

[andwan0]

On my Mint Linux I can run Subtitle Edit via Mono with no problems.
Now running on SteamDeck (ArchLinux). When I goto Auto-translate it gives me:

Windows Forms Thread Exception
An application error occurred in Subtitle Edit 4.0.8.0 - 64-bit - Microsoft Windows NT 10.0.18362.0.

Error Message:
Object reference not set to an instance of an object

Stack Trace:
at System.Windows.Forms.InputLanguage.get_LayoutName()
at Nikse.SubtitleEdit.Forms.Translate.AutoTranslate.EvaluateDefaultTargetLanguageCode(System.String defaultSourceLanguage)
at Nikse.SubtitleEdit.Forms.Translate.AutoTranslate.SetupLanguageSettings()
at Nikse.SubtitleEdit.Forms.Translate.AutoTranslate.nikseComboBoxEngine_SelectedIndexChanged(System.Object sender, System.EventArts e)
at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c
at System.Reflection.RuntimeMethodInfo.InternalInvoke
at System.Reflection.RuntimeMethodInfo.Invoke

:0

https://imgur.com/a/9oEFFMe