Thank you for sharing your heads up on this 👍
A few years ago I came across similar findings by owners and I'm sure it was in some tech articles online.
Ever since then I've stayed clear of case's with inbuilt magnets.
I use a vertical holster with belt clip to carry my phone around due to the nature of my workplace, and that had a magnet in the flap.
I immediately carefully extracted that from the flap and fixed some velcro in place instead.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I have no affiliation with Samsung.