It does look like it could be related to the Liquid Metal issue. Temperature 4 could be related to core 4, which tends to be the one with the most significant issue.
The one where it’s at 90+C is with an all core workload? Is it with the stock charger and performance mode? What is the clock speed of the cores while it’s doing that all core workload?
This is what mine looked like when I first started looking into the issue: Uneven CPU thermals! - #269 by Obasav
I was having similar symptoms, with the fans going nonstop at a minimal load, and significantly degraded multi-core performance (using cinebench as an demonstration)