NOTICE: I no longer have this issue. I deleted a few worlds (I had a lot of them), and it worked just fine.
Every time I join a world (same world joined each time), my credits, survival inventory, location when quitting (area to spawn at), and blueprint catalog are all reset to match a survival world I have. This means that everything I build is wiped from the primary catalog every time I leave, my credits are reset, and I end up in the middle of nowhere when I join.
Not visibly reproductible (all the recent glitches happen without my actions). Not that it actually matters, as nobody fixes my bug reports. Ever.
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