@ChunkyCat , it's not the same case, and on a careful consideration, I wouldn't completely rule out such thing straight off the bat. Thing is, at least originally, the effects of perfect and non-perfect Relequen were considered to be different, it was apparent by an early (and hastily fixed) bug when effects from different players couldn't stack (e.g. they were unique rather than per-player), and only two - at most - persons in a group could benefit from the set: that being the case when one was wearing perfected and another non-perfected version. So at least internally, even with bug that prevented stacking from different sources, perfected version was stacking with non-perfected.

I would think that it's also among the thing long fixed by now, but who knows.