Great to hear that things started to work.
Yeah, there were actually no changes addressing the precompilation threads in Julia, but some developers think what actually caused trouble is the number of spawned openblas threads (you can find their comments and links to commits in the thread below).
Julia 1.8.2 also seemed to fix the issue for me. I experimented with higher number of precompile tasks and things look stable. You might want to give it also a go, since it speeds up the installation substantially.