Hi! What do the UVs look like? Since some areas of the part seem to bake fine, probably not naming/bake group related, but perhaps due to some UVs overlapping? Ideally, you could attach some lowpoly + highpoly files for checking.
Short monster side project in progress. It's for a friend to use in his prototype. It has some sort of hands/claw like mandibles. Looking at the current state, it reminds me of a Bloodsucker found in Stalker. Probably do another pass on the highpoly and textures should be much more detailed and horrible of course. But I…