Hi there,
I've been able to reliably recreate that issue I had mentioned in Discord about essence icons disappearing for non-operators in Neoforge 1.21.1, Primal Magick version 1.21.1-6.0.6. It seems to be a mod conflict with FTB Library (Forge) version ftb-library-neoforge-2101.1.13. Pleaes note, operators are still able to see essence icons. Attached is a picture of the described issue.
Thank you for all your work!

The bad news is that I don't think I can fix the root cause of the issue. The good news is that I've added a workaround, which will go live with v6.0.7: a client-side config option, called "showAffinityIcons", which will render affinities as text instead of using the standard icon format when set to false. This should provide players with a way to get the information they need. Hope this suffices.