Thank you for the additional information.
Can I check if you have sensor cache enabled in the general settings for your project on the Sonarcloud UI? I can see from your logs that it is being used but it appears like the cache is being ignored in almost all cases.
INFO: Sensor cache enabled
INFO: Load sensor cache
INFO: Load sensor cache (19 MB) | time=2721ms
FYI I am currently trying to isolate where the issue might be occuring, I will update again once we have a more clear idea. I’ll keep you updated with the progress.