Memento bug in Ossuary

Like many others before me on different site discussion threads, I have encountered a problem in the Ossuary where you fight the Fabricator. The Small Painted Box Memento (that, weirdly, for some reason, looks like a dragon statuette and the previously obtained memento for Dragon Decoy looks like a black ball) grants 5o Caretaker points but does not appear anywhere in the library. All known fixes have been tried to no avail and yeas the game is up to date. Interestingly enough this is not my first playthrough having played the game multiple times previously. To confirm this is a problem I loaded the previous playthrough and the memento is in the library for that character's plathrough. For completionists this is an aggravatingly annoying issue.