Have a look at this product product/set-geluri-cover-girl/ everything works properly and nothing is frozen. https://gyazo.com/c2e16eca965c7f81dd6f5041d035b311 The product description was empty I have added the testing text and saved without problems.

The issue is on backend, not frontend.
On Product Edit pages as I mentioned on #160726

Also, you activated the Basel Theme, and now the Child theme is not working anymore. If I try to activate, I get a fatal error on my website?!