The bug
Small fireballs set fire at the block they collided with, even if this block is outside the world border.
How to reproduce
Stand near the world border in positive X direction and use the following command
/summon small_fireball ~5 ~10 ~ {Motion:[0.0d,-0.5d,0d]}
Related issues
relates to
Attachments
Comments

Can confirm for MC 1.12.1.
Confirmed for 1.13.1-pre1
Confirmed for 1.13.1
Can confirm in 21w03a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w08b. Video attached.
Can confirm in 1.16.5.
Can confirm in 21w13a.
Can confirm in 21w15a.
Can confirm in 21w17a.

Can confirm in 1.17.1 Pre-release 3.
Can confirm in 1.17.1.

Can confirm in 21w38a.

Can confirm in 21w40a.

Can confirm in 21w43a.

Can confirm in 1.18 Pre-release 1.
Can confirm in 1.18.2.
Can confirm in 1.19.

Can confirm in 1.20.5 release candidate 3 and 1.20.4
[media]I would also like to request ownership if possible, since the reporter has been inactive since 2022.

Can confirm fixed in 24w34a
Still in the 24w34a.
[media][media]