Not A Bug Encore-overridden choices interaction with Prankster on Dark-types

[Anima67781]

What type of bug are you reporting? Mechanics

What is the bug?
A dark-type, upon using Encore on a Prankster pokemon that used a status move on the last turn, can be hit and affected by that status move if the Prankster pokemon was attempting to use a damaging move on that turn.

See this replay at turns 5 and 6:
https://replay.pokemonshowdown.com/gen9randombattle-2141635134?p2

Are you able to replicate it? If so, how?
As a dark-type, use Encore on a prankster pokemon when they used a status move last turn (thunder wave, etc), as the prankster pokemon is attempting to use a damaging move.
We tested it with both pokemon going first in two different battles - behavior did not change based on either pokemon being outsped by the other.

 

[Anima67781]

UPDATE - cause has been found - it is a result of being forced to use a status move when the pokemon using the status move was attempting to instead use a damaging move before being encored. Not sure if still a bug - advise?

 

[Mathy]

reproduction: https://replay.pokemonshowdown.com/gen9ou-2141661587

input log

>version e046c5ea766451ca9500a73fe72ec774e92e6f7e
>start {"formatid":"gen9ou","seed":[10077,1907,5010,24075]}
>player p1 {"name":"Furret","avatar":"#psstaffm","team":"Impidimp|||Prankster|Taunt,Facade|Brave|,,,,,1|M||||,,,,,Dark","rating":0}
>player p2 {"name":"Chillet","avatar":"102","team":"Sableye|||KeenEye|Encore,SleepTalk|Timid|,,,,,252|F|,0,,,,|||,,,,,Dark","rating":0}
>p1 team 1
>p2 team 1
>p1 move taunt
>p2 move sleeptalk
>p1 move facade
>p2 move encore
>p1 move taunt
>p2 move struggle
>forcelose p2

don't know the correct behavior either, im sure someone tested it but research threads for gens 7-8 are not linked anywhere convenient

 

[urkerab]

There is a test for the correct behaviour which is that the Dark type is immune if and only if the Prankster user selected a status move. (Note that on following turns Encore also forces the selection of the encored move.)
https://github.com/smogon/pokemon-showdown/blob/master/test/sim/abilities/prankster.js#L63
https://www.smogon.com/forums/posts/7736003