Validation rules skipped on Gutenberg enabled post types

[bjorn2404]

This might be more of a Gutenberg issue at the moment but when adding validation_rules to a a field or even via the attributes method the validation appears to be completely skipped. If I add PHP code to disable Gutenberg, the validation functions as expected. I suppose this makes sense since Gutenberg is built with JS but I wanted to raise the issue here because I wasn't finding any related issues when searching.

On the Gutenberg side the following issue appears to be related: WordPress/gutenberg#13413