Issue with Render Fidelity

Hi there! This has been an ongoing issue for weeks, and after many attempts to fix this, I have run out of options.
I’ve been working on a game that heavily depends on performance, and my meshes need to be unloaded when far away enough. The render fidelity on this mesh(or any mesh I have) does not change whatsoever [They don’t change to a lower detail]. I’ve join different games with these same assets and they render perfectly, with the same RenderFidelity, yet mine don’t behave as such.
These were .fbx file meshes.
The mesh on the left is set to performance, while the right is automatic. Any help is greatly appreciated!

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i dont really use meshes but I want to atleast try to help.

could it be because of your rendering level? maybe it doesnt need to unload or something.
or maybe are they already up to standard for performance?
have you tried a normal mesh instead of a MeshPart?

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Yes. I get the same result. Nothing changes.

how many triangles does the mesh have?

About 800 triangles, from blender.

ROBLOX sometimes doesn’t change the fidelity due to it’s amount of triangles.
although the more likely thing is that this is a bug dating back to Jun 14 this year probably.

still it could be ROBLOX just being odd; maybe it works generally in-game with more objects or something? (doubtfully…)

I understand. But a game made after mine with the same meshes as me uses this, and they unload perfectly when 200ish studs away. I’m a bit frustrated because every game I created has the same consistent issue.