'Mutable' Skeletal Mesh Sections Partially Missing After Merging with “Extend Mesh Section

Hi everyone,

I have a skeletal mesh that uses multiple material instances. In my Blueprint (or C++ code), I retrieve the instance and texture information from each section, then merge them using the “Extend Mesh Section” approach. However, after merging, parts of the mesh are missing or appear clipped.

Has anyone experienced this issue or found a solution? I’ve checked bone influences and material slot assignments, but the mesh still ends up partially invisible. Any advice would be greatly appreciated!

Thanks in advance!