Mechanics Duplicate Strong Winds messages

[Cazenovia]

What type of bug are you reporting? Mechanics

What is the bug?
If a Flying-type Pokemon with Wonder Guard gets hit with a x4 effective move while strong winds are present, the message stating that strong winds weakened the attack appears twice.

Are you able to replicate it? If so, how?
https://replay.pokemonshowdown.com/gen7purehackmons-2144084505 (turn 2; turn 1 is acting as intended on cartridge)

 

[Hydrametr0nice]

This also happens if a Flying-type Pokemon gets hit with Electro Drift while strong winds are present. I think those should be the only cases (and Collision Course) because they use runEffectiveness.

 

[emikatana]

It's just happening because runEffectiveness runs the Effectiveness event which causes onEffectiveness to trigger, and then when the move hits and calculates damage, it runs Effectiveness again, causing the message to play twice.