If you use a riptide trident with a sheild equipped in your offhand, it will cover up most of the screen.
Steps to recreate:
Get a sheild
Get a trident enchanted with riptide
Go in water
Use the trident.
Linked issues
duplicates 1
Attachments
Comments 2

Thank you for your report!
We're tracking this issue in MC-127970, so this ticket is being resolved and linked as a duplicate.
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Invalid, modded game.