Going to the options.txt file and changing the FoV to a ridiculously high value (say 3.0) can cause the player to see through blocks near them, which could be used for cheating.
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migrated
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bemoty
Related to MC-92250, can confirm for MC 1.12.1.
migrated
Confirmed for 1.13.1.
j_p_smith
Confirmed in 1.15.2 and 1.16 Release Candidate 1.
pulpetti
In 1.16.1 and 1.16.2 Pre-1
Avoma
Can confirm in 20w51a.
Avoma
Can confirm in 21w05b.
migrated
This has been fixed in 22w12a with the options rewrite; the values are clamped to the in-game slider's values.