Happy Ghast slow, constantly moves mid-air + Invisible Nether mobs with add-ons in Preview 1.21.90 Bedrock.version

Summary:
In Minecraft Preview 1.21.90, the Happy Ghast moves extremely slowly—slower than boats on land—making it nearly unusable for travel. Additionally, when using Marketplace content or the Realistic texture packs and Action's and Stuff add-on, certain Nether mobs (like Ghasts and Magma Cubes) become invisible in both local worlds and Realms, affecting gameplay immersion and combat visibility. Additionally the Happy Ghast entity does not stay still when tamed, and it is very frustrating to mount and ride, as it's constantly moving in the air. When using the lead on the ghast, you'll have to break it in order to be able to fly away on it, which causes the lead to fall while riding the ghast. This issue could heavily affect single player worlds, as it causes the player to sacrifice a lead for the sake of being able to ride a Happy Ghast that roams the skies at a snails pace. This issue affects Android mobile phones, IPhone 13, and Android tablets.

Steps to Reproduce:

• Ride a Happy Ghast in the latest preview build (1.21.90).

• Observe movement speed compared to other methods like boats.

• Install Realismcraft by Spark universe or selected Marketplace packs.

• Enter the Nether and observe invisible entities (Ghasts, Magma Cubes), minecraft beta preview 1.21.90.21 for minecraft pocket edition.

Expected Result:

• Happy Ghast should move at reasonable or balanced speed.

• Nether mobs should remain visible even with custom SFX or Marketplace packs enabled.

Actual Result:

• Happy Ghast is extremely slow.

• Ghasts and Magma Cubes become invisible in the Nether.