I believe the root cause of this issue is this backported kernel commit: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/l2tp/l2tp_ip6.c?h=linux-6.1.y&id=f6a7182179c0ed788e3755ee2ed18c888ddcc33f
The commit is present from Linux v6.6 onwards and has been backported to at least the linux-6.1.y series stable kernels. I will work on a kernel fix, but in the meantime the go-l2tp package will have to remove the testcase in order to address this bug.
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