I created a Bootstrap theme, added some built-in blocks. All works fine. Then I activated the Design panel to change some colors and it destroyed the whole styling. Like Bootstrap css is not loading at all. Now when I want to deactivate the Design panel, I get an error:
I tried to reproduce this. I am also getting the same error. There are also some errors in the console which may help.
XML Error Not well-formed, URL: [...]/wp-content/plugins/pinegrow/pinegrow/frameworks/bootstrap5/bootstrap_theme/bootstrap/mixins/_banner.scss
The console also reports this for the other scss files, like mixins, grids, forms and so on.
A bit further down, this message pops up as well:
And it is. Wow, such a quick fix. Pinegrow FTW 
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