When a player gives themselves a potion effect via commands, setting hide [<hideParticles>] to true no longer stops particles from appearing as it did in previous snapshots. However, the particles that do appear aren't the correct ones for the effect applied.

Attached is a video showing what happens when a player sets particles to hidden, and what the intended particles for the same effect should be.

This also affects worlds that had infinite or ongoing effects from previous snapshot versions.

https://www.youtube.com/watch?v=AB-1MmtKHaI