Needs Triage Bug Report - Client

[C.Ezra.M]

What type of bug are you reporting? Client

What is the bug?
In Doubles, Arena Trap prevents a Pokémon from switching even if there is no confirmation that an opposing Pokémon has Arena Trap or another trapping Ability.
https://replay.pokemonshowdown.com/gen9randomdoublesbattle-2505048793
This only happened with Regirock. As for Ogerpon (on Turn 1), I was not prevented from switching, but the game did say that I may be trapped.

Bug in effect

NOTE: This image is hosted by Cubeupload because Imgur is blocked in the UK. I myself am not in the UK, but someone looking at this bug may be.

In singles, if there is no confirmation of the actual Ability of the trapper, the Pokémon is not fully prevented from switching.

Are you able to replicate it? If so, how?
1. One side must use at least one Pokémon with Arena Trap.
2. The other side can't use Ghost mons or ungrounded mons.
3. Start the battle.
4. One of the Pokémon won't be able to switch at all, even if there is no confirmation on the trapper's actual Ability.

 

[Hydrametr0nice]

This is not a bug, it is a server-side design choice. In doubles, you can always determine whether your Pokémon (except the last one) are trapped without committing to an action, since you have the buffer of the following Pokémon.

Theoretically, Regirock is in a "maybe trapped" state, but in practice, you can always confirm whether it is trapped or not. As a result, PS automatically does that for you.