My guess is that some fission process count limit has been raised or lifted since March and now we hit the X connections limit instead of this issue (which deal with re-using processes so is less likely if the process limit is very large).
Bug 1617078 Comment 17 Edit History
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My guess is that some fission process count limit has been raised or lifted since March and now we hit the X connections limit instead of this issue (which deals with re-using processes so is less likely if the process limit is very large).