yep, seems to be a common thing. happened to me yesterday, so i filed a lost assets claim (just to have a paper trail of events, really) and got a response already.

according to FDev support, nothing is actually lost. the backend system still has (at least in my case) all claims data and its just not displayed correctly in game. the ticket was for both my systems Paradiso and Col 285 Sector FA-W a45-1 and sure enough the latter is already fixed!

There’s at least one issue report like this on the tracker so I would suggest starting an issue there or adding to existing reports

https://issues.frontierstore.net/reported-issues/elite-dangerous