attacking an entity in creative mode, then switching to survival adds 5 ticks of block break delay

When attacking any entity in creative mode then switching to survival after any amount of time, it will take 5 additional ticks to break the first block after switching to survival mode.

Code analysis:
The last if statement (including body) in the MultiPlayerGameMode::attack method was newly added in 26.3:

public void attack(final Player player, final Entity entity) {
      this.ensureHasSentCarriedItem();
      this.connection.send(new ServerboundAttackPacket(entity.getId()));
      player.attack(entity);
      player.resetAttackStrengthTicker();
      if (player.getAbilities().instabuild) {
         this.destroyDelay = 5;
      }
   }

The destroyDelay field doesn’t seem to do anything in creative mode and it also doesn’t decrease every tick, but instead only decrements when the player tries breaking a block in survival or adventure mode.