w3c/webrtc-stats#805 (comment)

I am a bit surprised that no actual DTLS negotiation is required but that seems consistent across browsers?
https://w3c.github.io/webrtc-pc/#sctp-transport-connected might need to be updated as it currently says

Once an SCTP transport is connected, meaning the SCTP association of an RTCSctpTransport has been established

but as https://jsfiddle.net/fippo/gLs015hm/6 shows the SCTP transport exists without packets being exchanged.
The specification is safer as it since it avoids my potential (theoretical?) concern about role conflicts but browsers behave differently and seem to determine the odd/even based on the DTLS role negotiated in the SDP (which seems ok)

I can volunteer a WPT but from the screenshot looks like implementations agree.