Fireballs redirected by explosions caused by player owned entities no longer carry player ownership. In previous versions (1.16-1.20.4) when fireball was damaged by an explosion caused by player owned TNT or fireball, the redirected fireball would become owned by the player, in 1.20.5 and up this doesn't happen. 

Steps to reproduce:

1. Run /summon fireball
2. Place TNT near the fireball
3. Ignite the TNT with flint and steel or Flame-enchanted bow
4. Run /data get entity @n[type=minecraft:fireball] Owner after the TNT explodes and the fireball starts flying

Observed result:
"Found no elements matching Owner" is returned

Expected result:
The Owner's UUID is returned, like in 1.20.4 and below.