1.16.4-1.13.9
By armour attributes I mean the attributes armour can get from the stellar refraction table.
In singleplayer, taking off any piece of armour and putting it back on fixes it.
In multiplayer, taking off any piece of armour and putting it back on kinda fixes it, but also causes another bug (#1677).

i posted a similar (i think) issue on DW20 github about block transmutation needing relinking after rejoining world. related?

Maintainer edit: removed link as unrelated issue.

i posted a similar (i think) issue on DW20 github about block transmutation needing relinking after rejoining world. related? FTBTeam/FTB-Presents-Direwolf20-1.16#149

That's probably a different issue. I vaguely recall seeing that reported before, so please search before reporting it.