Data channels do not fully close when close initiated from Chrome

[nerd2]

In my application where Pion is offering and Chrome is answering:

• Pion application starts a datachannel
• The Javascript in Chrome explicitly closes the datachannel
• Pion receives the datachannel onclose event
• But Chrome's data channel stays in the "closing" state and is never "closed".

Perhaps pion is not doing https://tools.ietf.org/html/draft-ietf-rtcweb-data-channel-13#section-6.7 correctly when the close is initiated remotely?

Using pion/sctp v1.7.11

@Sean-Der suggested I reference @enobufs as you might know if this is expected behaviour