If Obsidian Shards operate like most other collections, have you checked the special collections tab for them? I’ve found some new tabs added to my collections way off to the side where I never expected them to be located.
Otherwise, you may want to open a Customer Service ticket for this issue.
Obsidian Shards do indeed have their own slot in the Collections tab now, under Rare Crafting Materials. The odds of 200 Obsidian shards magically vanishing seems improbable so I would check there.
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