I decided and managed to clean up the memory content using the NFC Advanced commands. I was hoping that any corrupted text would go away. Then I was all clean but the tag still didn’t accept to write anything on it.
Then I found the TagWriter App and tried to use the erase & format. It didn’t work either because it complained that the tag was protected.
Then I tried to write anything again just to test. I was surprised that it worked! TagWriter managed to write while NFC Tools could not. Why? I’m puzzled.
I’m sending the TagInfo after the fix for you to compare. It seems to have less memory blocks.
I’m happy that I can use my tag again \o/ 
04-9B-7A-32-94-51-80_2022-01-16 02-28-53_taginfo_scan.txt (11.5 KB)