When I imported an Excel sheet to Proton, some of the existing formatting rules had ranges that exceed the 1000-row limit on Proton. This made all of them break, and I had to edit them one by one in order to fix them. Additionally, I am unable to delete the broken formatting rules unless I fix them.

Please increase the row-count limit AND when importing formatting that is not compliant with your limits, automatically adjust it and display a warning that you need to do that.