I believe this is fixed since 5.6.1. Quoting from the upstream changelog
https://wiki.strongswan.org/projects/strongswan/wiki/Changelog56
"No hard-coded default proposals are passed from starter to the stroke
plugin anymore (the IKE proposal used curve25519 since 5.5.2, which is
an optional plugin
Package: strongswan
Version: 5.5.3-2
Severity: normal
Dear Maintainer,
On a fresh installation of Debian testing/sid with strongswan 5.5.3-2,
all connections which are not configured to use IKEv1 fail with the
following error message:
initiating IKE_SA example[6] to x.x.x.x
configured DH group C
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