Players still earn advancements in spectator mode

The Bug

A player can still earn advancements in spectator mode, and they are still broadcast to the server. You can test this by going into spectator mode, and /giving yourself an elytra.

Steps to Reproduce

• Revoke all advancements from yourself.

  /advancement revoke @s everything
  

• Switch into spectator mode and give yourself a lava bucket.

  /give @s minecraft:lava_bucket
  

• Take note as to whether or not you are granted the "Hot Stuff" advancement.

Observed Behavior

Players are able to earn advancements whilst in spectator mode.

Expected Behavior

Players would not be able to earn advancements whilst in spectator mode.

Code analysis

Code analysis by [Mod] Avoma can be found on this comment.