The bug

If a spawner is set to spawn dragon fireballs, the dragon fireball rendered inside of the spawner appears very strange due to a combination of the effects of MC-250134 and MC-255847. From some angles, the projectile can even appear one-dimensional, effectively making it invisible from that angle.

How to reproduce

1. /setblock ~ ~ ~ minecraft:spawner{SpawnData:{entity:{id:"minecraft:dragon_fireball"}}}

2. Enter Spectator gamemode
3. Observe the miniature entity inside of the spawner

Expected results

The shrunken entity would be visible from all angles.

Actual results

Some camera angles can make the dragon fireball appear extremely thin and hard to see.

How to fix

Fixing MC-250134 or MC-255847 would largely mitigate the effects of this bug, and fixing both would likely get rid of it entirely.