Did it ever run longer, like reported? There have been prior reports of high CPU usage, typically with mono.
Battle plan for migrating to .Net8 will get off of mono and .NET Framework, but the work is still in progress.
After more time, is the 12:50 PM log output the only one? Also view About → Show log → Live → Profiling.
Is that 100% of one core? I think Windows Task Manager would only say 100% if one got all cores up there.
What other activity (if any) can you spot with whatever you use for tools? Any disk I/O visible, for example?