Hi there. Please check your vault in-game for any missing materials. If you're using DIM, there is a setting in this app that moves items to your vault so your inventory doesn't become full while farming, so you may want to turn that off.
If you cannot find them, Bungie does not restore lost or deleted items.
https://www.bungie.net/en/Help/Article/12211
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Well maybe Bungie should investigate that there isn’t a problem on their end instead of replying the usual ‘Bungie doesn’t give lost/deleted stuff back’. If it happened on my end that’s on me. But if it’s on your end that I’m missing stuff then that’s on you, and that’s why I’m asking for an investigation.