There is bug in CTF having teleporter.
If you stay on the teleporter, you won’t be damaged by enemy players.
I think all platforms have this bug.
(I’m Japanese, so my grammar may be wrong. Sorry.)
1.20.12
Android
I don’t have any images or videos, but you’ll understand what it is
if you try.
Hey there 
Thank you for taking the time to report this issue. It has been logged and you can look forward to a fix in a future update.
Stay safe and well
Hey there
We appreciate your patience, we believe this issue is fixed. Please create another bug report if you experience any further issues.