Github user gtenev commented on the issue:
Chatted with @shinrich offline and she is going to mark related fixes
TS-4813 and TS-4507 for backport from 7.0.0 to 6.2.1, which should take care of
the "missing to delete the stream cases".
Submitted a new PR against master #1117 to add the "safety net" delete
stream call in `destroy()` before `THREAD_FREE()` and backport to 6.2.1
(changes are not 6.2.1 specific anymore).
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