Drowned do not immediately lose aggression when the player switching to Creative or Spectator mode

relates to MC-311841 and MC-311848

Steps to Reproduce:

1. /summon minecraft:drowned ~ ~ ~ {equipment:{mainhand:{id:"minecraft:trident",count:1}}}

   spwan a trident drowned

2. switch to Survival mode and run away

3. Keep distance from the Drowned and switch back to Creative mode.

4. The Drowned keep chasing the player for a while.