This is mostly for the devs:
Numerically sorted engram list. When adding/changing engrams, any changes in level requirements are not sorted. And any new engrams appear after the L75 engrams. Solution: before displaying engrams (in PIE or ingame) they should be sorted by level requirement.
Blank engrams list in PIE when using additional engram. If you add an additional engram via PrimalGameData, then using PIE to test… the Inventory->Engram list is blank. You have to restart the devkit to show them again in PIE.