I created a ticket about this issue, and was advised that I create a post here in the Bug Report Forums.
Many of the Ensembles available in Remix contain 10’s to over 100 item appearances as seen when CTRL + Clicking the Ensemble, or using the All The Things addon. Unfortunately, it seems that when purchasing and using these Ensembles, not all of the item appearances are being added to the Appearances collection.
For example; the item “Ensemble: Shan’ze Warplate” (item ID: 215319) contains the appearances of 123 different items. Upon use, the item is removed from my inventory and the appearances of those 123 items should have been added to my collection. Only 45 of those item appearances were added to my collection.
A non exhaustive list of the Ensembles that I’ve purchased, used, and are now missing item appearances from is below:
215229
215297
215313
215315
215317
215319
Thank you for your attention to this issue.