Filled cauldron extinguishes burning arrows that hit either side of the cauldron.
What I expected to happen was...:
A burning arrow stuck in the cauldron.
What actually happened was...:
An ordinary arrow appeared, and one layer of water was removed from the cauldron.
Steps to Reproduce:
Put the cauldron and fill it with water or powder snow.
/setblock ~1 ~ ~ water_cauldron
Shoot the cauldron from below with enchanted bow with "Flame".
Note: After 17w47a, the arrows that hit the cauldron's top are now extinguished, but they are still extinguished if they hit the sides of the cauldron.
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Sounds like it may be checking if the arrow landed on the top/watery side of the cauldron, but is incorrectly inverted so that it actually checks if it isn't in the water.
[media]
Confirmed for 1.13.1.

This is because of the size of the arrow hitbox, so it goes in the the cauldron. This can be fixed if the devs lower the size of arrow hitboxes
You can see the hitbox with F3+B

Affects 21w05a

Requesting ownership as the current reporter has been inactive for over a year
Can confirm in 21w06a.

affects 21w07a
Can confirm in 1.16.5 and 21w08b.
Video attached.

affects 21w10a

Affects 21w11a
Can confirm in 21w15a.
Can confirm in 21w17a.
Can confirm in 1.17.
Can confirm in 1.17.1.
Can confirm in 21w41a. The expected behavior would be that flaming arrows shot on the side of water/powder snow cauldrons would not be extinguished and would not decrease the level of cauldrons.
Can confirm in 1.18.1.
Can confirm in 1.18.2.
Can confirm in 1.19.
Can confirm in 1.19.2.

Can confirm in 1.19.3.

Can confirm in 23w33a