Synth maps not counting for Gallant Grinding Goals

TL;DR: Synth maps aren't counting for the 4th GGG challenge.

Gallant Grinding Goals, 4th challenge, reads: "Complete Shaper, Elder, Conqueror or Memory Guardian Maps with at least 100% Item Quantity"

Completing any of the synth maps (Altered/Distant/Augmented/Twisted Memory Maps), which all have a default item quantity of 100%, do not appear to be counting.

This seems like either a mechanical bug, or a wording issue if "Memory Guardian Maps" is not meant to apply.

Thanks,
Mico