Disappearing of handwritten comments in Acrobat Android app after last update

After the last update, I was working on a simple pdf file (generated from Latex via pdflatex) and noticed that one out of ten times a handwritten comment (android app on a Samsung Tab S7+) would disappear directly after "switching off" the pen on the top menu. It felt like it had something to do with specific shapes/points on the page; if it disappeared and I would try again to draw the same circle / write the same text at the same spot, it would disappear again after switching off the pen. As said, nine out of ten comments went through without trouble... Never happened before the last update.