Hi,
unfortunately, I have experienced several times that when changing/adding a new password to an existing entry, a random other password from the same entry has been corrupted. Various special characters are no longer displayed, meaning the password is gone, like this one:
This happens while the entry is still being edited. If I notice it before saving the changes, I can still cancel it, but if not, it's gone. I think I had this problem with MacOS before, but I'm not sure. In any case, the problem exists on Android.