Missing collection after syncing between two PCs

Howdy
Yesterday afternoon I conducted a fairly in-depth literature search and began a new collection in Zotero Standalone on my home PC. Today on my work PC, after syncing, the new collection is missing entirely.

Logging into Zotero via Chrome shows the new collection as missing too. Any ideas about where the new collection is or how I might be able to find it again?

Really starting to worry that I've lost an afternoon's worth of work!!

TIA,
Jess
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