Multiple Imported Animations Affect Previously Imported Actions

[ankrudov]

Hi,
Versions used
Polyhammer addon 5.4.0
Blender 4.5
Unreal 5.7

My current workflow is:

Retarget animations (mixamo, unreal etc) to MetaHuman in Unreal (this flow) https://www.youtube.com/watch?v=MT8URTYCLdM
Export the retargeted animation from Unreal following the standard flow of polyhammer
Import the animation into Blender using the addon import workflow
export actions for use in Godot

The issue is:

The FIRST imported animation works correctly
Additional imported animations create new actions as expected
However, after importing more animations, previous actions begin showing orientation issues, animation overlaps etc

Symptoms:

Frame 0 looks correct
From frame 1 onward, the animation plays while the character appears stuck partially in an A-pose
Sometimes there is also a slight X-axis orientation/lean issue
The actions themselves appear unique and separate
Unreal retargeting itself works correctly; the issue only begins after multiple imports/actions inside Blender

Things I’ve noticed:

Importing directly to the body rig improved the issue somewhat
The Action Editor shows “Legacy Slot”
It feels like imported animations may still be sharing some rig state, rig logic state, FK control state, or slot bindings after additional imports
It seems like later imports affect evaluation of previous actions
baking the animations does fix the issue and keeps the rig in regular pose

Questions:

What is the correct workflow for importing multiple body animations onto the same MetaHuman rig while keeping each action fully isolated/independent?
After baking, is there a recommended step to clear/remove imported rig logic or FK control animation state?
Should baked actions be applied to deform/body bones only?
Is Blender 4.4+ “Legacy Slot” behavior expected with the addon?
Are multiple sequential animation imports into the same rig/session officially supported?
Is there a recommended cleanup/reset process between imports?

Goal:
I want to maintain a single MetaHuman rig in Blender with many separate named actions(animations) that can later be exported to Godot.

Any guidance would be appreciated. Thanks!

[jack-yao91]

Hi, its hard to say for sure without some screen shots or recordings, but I am going to guess that you selected an action that wasn't meant for an different armature in Blender.

It can be an easy thing to do when toggling between pose mode and selecting actions for multiple characters. The animation import has a prefix option to put the rig instance name into that imported action name. This can help the user determine the correct action to select, however, blender's action editor will allow you to select any action even though the might not be compatible.

Hopefully I am understanding your question, but If you have a specific breakdown of the issue I might be able to help better.

[ankrudov]

I think i somewhat fixed it, i used force evaluation and new actions. But I believe the addon isnt meant for non metahuman animation which might be why im having some orientation issues.

Ive installed the character controller addon which is another issue I'm running into which I've left as a question in that repo.