There are many topics about it already on forum:
https://forum.torproject.org/t/sctp-error-0x378e7e0-stream-1-not-found/4984
https://forum.torproject.org/t/snowflake-sctp-error-0xc0001bf880/4983
https://forum.torproject.org/t/sctp-error-in-snowflake-log/3854
No one can say for sure why it is happening, but this problem do not significantly affect proxy operation.
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