Not A Bug Dark Types are Immune to Prankster Boosted Status Moves

[Zebracheetah]

What type of bug are you reporting? Random Battles

What is the bug?
https://replay.pokemonshowdown.com/gen9randombattle-2150907025 Thunder wave should have worked on incinaroar

Are you able to replicate it? If so, how?
I can't cause random battle

 

[Tea Guzzler]

Dark-types are immune to any moves boosted by Prankster.

 

[HoeenHero]

Dark-types are immune to any moves boosted by Prankster.

This ^

See also: the battle log which includes hints that explicitly say this:

Sableye used Thunder Wave!
(Since gen 7, Dark is immune to Prankster moves.)
It doesn't affect the opposing Incineroar...