CSS environment variables throwing error when used with max()

[fsaenger]

input.scss

@supports(padding: max(0px)) {
  .test {
    padding-left: max(12px, env(safe-area-inset-left));
    padding-right: max(12px, env(safe-area-inset-right));
  }
}

Actual results

libsass 3.5.0.beta.3

Error: "env(safe-area-inset-left)" is not a number for `max'
        on line 3 of stdin
>>     padding-left: max(12px, env(safe-area-inset-left));
   ------------------^

Expected result

@supports(padding: max(0px)) {
  .test {
    padding-left: max(12px, env(safe-area-inset-left));
    padding-right: max(12px, env(safe-area-inset-right));
  }
}

version info:
Same as used in SourceMap Inspector, linked above, libsass 3.5.0.beta.3.

First ran into error with:

$ node-sass --version
node-sass	4.7.2	(Wrapper)	[JavaScript]
libsass  	3.5.0.beta.2	(Sass Compiler)	[C/C++]

Why this should work

This is the recommended syntax by the WebKit team to adjust CSS for iPhone X, see:
https://webkit.org/blog/7929/designing-websites-for-iphone-x/

[fsaenger]

Sorry, couldn't properly link to SourceMap Inspector because it doesn't store code that throws errors.

[nschonni]

Duplicate of #2521

[fsaenger]

Sorry about that, @nschonni, my mistake.

[nschonni]

No problem, it happens