Swap Texture Packs not working for 1.20.4 experimental worlds

[startFX]

Did the issue happen after restarting Blender?

• [X] Yes, the issue indeed continued after restarting Blender

Check known issues

• [X] I have checked known issues, and my problem is different

What happened?

Using the Prep Materials feature on a jMc2Obj 1.20.4 world with experimental settings for 1.21 features enabled w hile using a custom LabPBR 1.3 resource pack does not work. At the bottom of the screen, there is a popup saying "0 materials affected". What I excepted to happen was Blender to just Swap the texture pack.

What steps are needed to produce the bug?

1) Export a Minecraft 1.20.4 world using jMc2Obj while making sure new blocks from the trail chambers are being selected. 2) Import the .obj into Blender using the obj world import feature. 3) Prep materials with the default texture. 4) Swap Texture Packs to https://modrinth.com/resourcepack/pixlli/version/jMva4izJ

What version of MCprep are you using?

MCprep 3.5.3

What version of Blender are you using?

Blender 4.1

[StandingPadAnimations]

This isn't an MCprep bug, this is a bug with your resource pack. We also don't support Minecraft snapshots

[StandingPadAnimations]

Closing as won't fix