• Dynmap Version: v3.7-beta-4-935
• Server Version: Paper-423 1.20.4
• Pastebin of crashlogs or other relevant logs:

[18:16:04] [Server thread/INFO]: [dynmap] Disabling dynmap v3.7-beta-4-935
[18:16:04] [Server thread/INFO]: [dynmap] Unloaded 11 components.
[18:16:04] [Server thread/INFO]: [dynmap] Stopping map renderer...*

These are the last lines in the server log.

[x] I have looked at all other issues and this is not a duplicate

The Docker container closes the server before it has been fully terminated.
It always ends at dynmap. My other ticket was closed, although the reference to the duplicate is not correct.
Unfortunately, the problem occurs too irregularly to reproduce it.

I don't think so. The host uses SSD hard drives.

then your disks your host is using are to slow for dynmap to properly save its progress

On the current game host I cannot adjust the waiting time myself. The host says it uses the default values.

then probably your wait time on process exit is too short, i am not using docker and never saw this. try to make the docker wait until the java process stopped fully, before shutting down