Thank you for the information. I didnt know such module and I happily installed it. Though I am afraid it did ton fix anything. I just rebooted after installing and the same - several minutes into recovery and finally snapped in and worked : (I also have this module installed without problems, as there is no recovey for Pad5, it is a good idea to install in magisk the module Magisk Bootloop Protector, which serves exactly to prevent what you are afraid that happen with your tablet
Anyhow I installed the module in "Auto" mode. Was it a mistake? Should I have selected other mode?