Yeah Dan, thanks for chiming in.
In particular that would be at least (but not lmited to) the changes:

8.04
Rework DTLS MTU detection. (#10)
7.08
Support automatic DTLS MTU detection with OpenSSL.
7.07
Automatic DTLS MTU detection.

Ubuntu has these newer versions.
Bionic 18.04 is on 7.08 and the most recent LTS Focal is at 8.05.
The current development release is at the latest 8.09 of openconnect.

These are new features added in 7.07 and 7.08 - IMHO they do not qualify
for a SRU release into Xenial [1] - especially since you can "get away"
with a config change that mitigates the issue.

[1]: https://wiki.ubuntu.com/StableReleaseUpdates

** Also affects: openssh (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: openconnect (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** No longer affects: linux (Ubuntu Xenial)

** No longer affects: openssh (Ubuntu Xenial)

** Changed in: openssh (Ubuntu)
       Status: Confirmed => Invalid

** Changed in: openconnect (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: openconnect (Ubuntu)
       Status: Confirmed => Fix Released

** Changed in: openconnect (Ubuntu Xenial)
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/1874257

Title:
  SSH fails with connection timed out - in VPN and hangs here "expecting
  SSH2_MSG_KEX_ECDH_REPLY" + Ubuntu 16.04.6 LTS

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