I wished I knew this before I ordered my MagSafe case. S-Pen Interference.
I've also used a bunch of different magnetic cases with the S21U, S23U and S24U and none of them have caused an issue with the pen on their own. I do have accessories and they do mess with the pen, but that's such a non issue in my opinion because of how easy it is to attach and detach them.
Crazy thing is, everyones so terrified of the big scary magnets (how the fork do they work?) but nobody seems to have noticed that the Galaxy Tabs and their official cases are full of the damn things... I've counted, and my Tab S8 and its keyboard case have OVER 9000 magnets. ironically, there are at least 2 different sets designed specifically to attach the S-Pen! and And the magnets in the pen itself that attach to the tablet! SO SCARY!
This should tell us 2 things in my opinion. first magnet not danger for pen or user. Second, Samsung could have probably added that there Qi2 to the Ultra if they wanted... them keyboard case magnets be pretty stronk.
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