The running theory is that there is some database issue that is causing the bloat. But it is hard to specifically point to a root cause if we're not able to reliably reproduce the issue.
Jellyfin 10.10.7 (Docker)
Ubuntu 24.04.2 LTS w/HWE
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
4x WD Red Pro 6TB CMR in RAIDZ1