Search does not work on my tablet, but works fine on my phone

Search does not work on my tablet, but works fine on my phone

Using Nimbus on the phone on a Galaxy A51 the search works correctly when searching foldernames / notenames and works fine when searching words inside notes.
And so it did on my Galaxy Tablet A6.

Now I changed to a Tablet A8 and only the search for Foldernames is functional. I cannot find words whithin notes. The cursor keeps blinking, nothing happens.

My phone and my Tablet A8 have the same Android versions (13)
I did a lot of trying on both. It is constantly fail on the Tablet.

One disturbing fact by the way: when i start a search and turn the phone or Tablet from landscape to portrait, the search is immediately stopped. This is certainly not a feature, is it?