When dealing with ominous trial spawner, the spawner can spawn ominous item as a projectiles or potions, however, on Bedrock, it doesn't have a spawning sequence phase, so the potions or projectiles gets instantly spawned, while on Java, it does have a sequence of the potions or projectiles spawning.
Steps to Reproduce
Set up the trial spawner with any spawn eggs (preferably passive mobs for easier repro)
Get yourself the bad omen effect
Switch to survival mode
Let the trial omen convert the spawner to ominous trial spawner
Pay attention to the ominous item spawning
Repeat the process on Java and compare it
Observed Result
The potions/projectiles spawned by ominous item are instantly dropped/spawned to the players/entities.
Expected Result
The potions/projectiles have a spawning sequence phase before it is dropped/spawned.
Confirmed