On a clean instance with Fabric, teleport of a minecraft:item_display entity works flawlessly. Once ReplayMod is added, it breaks and seems to jump around between two locations.

Steps to reproduce:

• place two command blocks
• keep the first on impulse with command summon zombie ~ ~ ~ {Passengers:[{id:"minecraft:item_display",item:{id:"minecraft:iron_axe",Count:1b}}],ArmorItems:[{},{},{},{id:"minecraft:iron_helmet",Count:1b}],ActiveEffects:[{Id:14,Amplifier:1b,Duration:-1,ShowParticles:0b}]}
• set the second to repeat with command execute as @e[type=minecraft:item_display] at @s run tp @s ~ ~ ~ facing entity @p
• run the impulse block
• activate the repeat block

Support thread: https://discord.com/channels/708304818829262910/1103748525566734336

This bug still exist
Do you have plans about fix?

Also having this behavior:

Only having Replay Mod (1.20.1-2.6.13) installed without other mods.

The entity is an item_display on an armor_stand (with motion) and the Rotation[0] value is copied from the player, so it rotates with the Player's Head Rotation.

Vanilla Behavior
Replay Mod Behavior

Test World replaybug.zip