When go underwater your FOV zooms in (probably for aesthetics) but wat you are holding does not, so if you are searching for buried treasure and go underwater the cross is at the rightest side of the map, it obscures it making it difficult to find it.
MCPE-232737
When going underwater your FOV zooms in and can cause obscured places on a map.
Resolved
Duplicate
0
Hi!
Thank you for your report!
We're already resolved this issue at MCPE-73092, so I will link this ticket as a Duplicate.
I suggest also browsing through the main issue for potential fixes.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki