I also have this issues after the latest update, Samsung really need to fix this issue! I use Galaxy S20 FE (Snapdragon)
I have the same issue on my s20+
I am having the same problem since I updated the software last week. I am using note 20 ultra. So frustrating Samsung should fix it soon!
I have a s20 5g and tried the suggested fix re. tuning off the "show in front" option. It didnt work ! Not only that I have noticed that if I dont send my message quickly enough when using the Messenger App the text get cleared, probably at the same time as the messaging app get started automatically. A fix is definitely needed some where here.
Apologies for my last message. I've now restarted the s20 and the fix (show on top - not in front) does indeed seem to resolve both problems 😊
I also have an S20 5G. I don't think it's malware. I have AVG installed and scanned regularly. The always on top setting = off has fixed it for me.
And same here. Galaxy S20 FE 5G. It's annoying, but I would be content to learn that it is not someone making screen shots and messaging them to themselves.