This is most likely a duplicate, but I searched for 10 minutes with several keywords and could not find a glitch like this, so I apologize in advance. While walking though caves, every few blocks a weird flash would come across my screen. I eventually stopped to see what it was, and it was a visual glitch. It seems that the higher your FOV is, the more visible the affected area is (for obvious reasons) Photos showing both normal FOV and Quake Pro FOV are attached.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-63020, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.