Sentence case deletes first letter of each line.
I use the change case multiple times daily, since I frequently receive text content in all caps. I recently started using Illustrator CC 23.0.2. Anytime I use (specifically) the "sentence case" option it deletes the first letter of each (paragraph) line. It's extremely annoying. I have to open InDesign to do it and change it there, then bring it back into Illustrator.