After upgrading to v2.3.3 stuck downloading index

I had the same problem with ESP json indexes getting stuck downloading after upgrading to 2.3.3 as well.

I tried a bunch of things to fix it; but what ended up working for me was just ensuring that the serial monitor was closed.

Open the serial monitor and then close it. When I did it, the indexing completed the exact moment that the serial monitor was closed. It was opened by default due to my past project preferences.

I believe that the issue has to do with establishing AF_UNIX sockets and some sort of resource locking mechanism blocking the read/write functions of the background processes.

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