Using named collections with server versions that don't support them seems to not fail

From couchbase shell, via the rust SDK, I'm running commands against server version 6.0. I've tried doing an upsert with a named collection and the command is sent to the server as usual and I see the doc created in the bucket. The behaviour in the Go SDK in this case is to fast fail with an unavailable feature error, which is the behaviour that I was expecting to see here too.