TheNewClassics

Couple more things I've figured out @AstroBob that could potentially be helpful narrowing down the issue.
- I've tried a fresh install of LB 13.17 in a different folder. I still seem to get NET core errors.
- Tried reinstalling/uninstalling NET core 6.0 and 3.1. Also ran sfc /scannow with no improvements.
I'm thinking it could be helpful to go back to the version before LB switched to the newer NET core version, but I'm unsure where I would find an particular older version of LB. Is there a repository somewhere for the older versions?
 
(10/27 update):
Continuing to look into this, I searched for the specific error code I was getting. Several different resources mention a possible issue being background garbage collection, "gcConcurrent" setting used within NET core. The couple resources I found: 
 
https://learn.microsoft.com/en-us/dotnet/core/runtime-config/garbage-collector (specifically the Background GC part)
https://stackoverflow.com/questions/4367664/application-crashes-with-internal-error-in-the-net-runtime (mentions the error and it potentially having to do with garbage collection)
 
I'm now trying to see if I can change that setting within the LB runtimeconfig.json file itself. Guessing I might break something in the process, but if this extra info provides any chance of a repair it's worth it.
 
After all that, this looks to work for me. I added this to my LB runtimeconfig file and I'm not getting the crashes with updating metadata/media anymore.
{
   "runtimeOptions": {
      "configProperties": {
         "System.GC.Concurrent": false
      }
   }
}