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by cesarb 4262 days ago
It's well-known that the fallback can be triggered by accident, see for instance https://tools.ietf.org/html/draft-ietf-tls-downgrade-scsv-00:

"[...] Also, handshake errors due to network glitches could similarly be misinterpreted as interaction with a legacy server and result in a protocol downgrade."

Perhaps that's what you're seeing.