Hi. Did you ever got a resolution to this problem outside of rolling back to 10.4? I have recently moved some workloads over to runtime 11.3 and am experiencing intermittent "repl did not start in 30 seconds." errors.

I have increased the repl timeout as per Microsoft advice to 150 seconds but this hasn't fixed the issue. They have also suggested increasing the size of the cluster, but this doesn't feel like the right solution.