Issues when baking high-res (match by name)

Hi,

I have been encountering issues when trying to bake my high-res mesh in substance painter. As it can be seen in the attached image, one area of the mesh (which is a seperate piece) is not coming out properly - it is black in the AO map, and did not bake in any of the passes. It is named appropriately (_low and _high) and does not have any UV issues, it is also matched up with the low-res properly so I'm not sure why this is happening. When using "always" instead of "match by name" it works okay, but I wanted to try and understand why this issue is occuring. Attached are also the settings I used for the bake.