Your system information

• Steam client version (build number or date): 1741737356
• Distribution (e.g. Ubuntu): Debian bookworm-backports
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes
• GPU: Nvidia
• Proton: 8.0-5

Please describe your issue in as much detail as possible:

Steam client won't quit for 2-10 minutes after playing doaxvv.
When I tell the Steam client to quit, access to the SSD goes to a busy state of nearly 100%.
The following errors are continuously logged in the system log:
steam[41760]: Thread "CJobMgr::m_WorkThreadPool:2" (ID 42157) failed to shut down

I checked using atop and fatrace and found 99% read access and 1% write access to the following file.
~/.steam/debian-installation/steamapps/shadercache/1361350/fozmediav1/video.foz (8.9GB)
This looks like a bug to me because of the abnormal read accesses. Please check if it is a bug or not.
This is an issue that's been around for over a year.
If I launch the Steam client and then exit the Steam client immediately without starting doaxvv, it takes 2 seconds to exit.

Steps for reproducing this issue:

(Proton 8.0-5)

1. Launch "DEAD OR ALIVE Xtreme Venus Vacation"(doaxvv https://store.steampowered.com/app/1361350/DEAD_OR_ALIVE_Xtreme_Venus_Vacation/)
2. Play beach volleyball once.
3. Exit doaxvv.
4. Exit the Steam client.