METRO UI Builder minify code does not work

[klaus-liebler]

Describe the bug
The METRO UI Builder at https://builder.metroui.org.ua/ has switches to minify code and to include source maps. These buttons do not have an effect: The code is neither minified (I tried both switch position) nor there is a source map includes (which make sense only if the code was minified, of course)

To Reproduce
Go to https://builder.metroui.org.ua/build.html and try to download minified code.

Expected behavior
Minified code ad source map in the zip-file, if the appropriate switch position has been set