Upon login my equip [armory]Rival Titan Shell[/armory], the Guardian Games Ghost shell, was removed from my character, pulling any Rival shell from Collections deletes the shell upon leaving the character screen.
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Same here, started Warlock with "empty" shell slot - had Rival Shell before. DIM showed at least the Rival Shells of Hunter and Titan still in place. After playing with Hunter, the Rival Shell was gone here too.