There is a rather lengthy topic about an issue that was identified with version 2.25.0 (3) and beta version 2.26.0 (2) of the iOS app.
This wasn’t actually about the display clearing, but about it refreshing after an idle period or losing focus then duplicating the previous output of the terminal and causing duplication.
However, it does sound somewhat connected, and maybe the “keep alive” solution of writing ‘nothing’ to the terminal every 10 seconds would help the problem if it recurs. Here’s a link to the relevant post of using a timer to write ‘nothing’ to the terminal, but if you have a spare hour of your life that you don’t want back then you can read the whole topic…
Pete.