Have you audited the IPv4-codepaths?
Your comment contained no information above "I don't trust it".
> Have you audited the IPv4-codepaths?
Are you for real?
There's been decades of production experience with IPv4 and does mostly what's expected.
Of course IPv6 shouldn't be trusted.
New software has bugs. That applies doubly for networking code.
Get your fuzzers started ...
Are you IPv6 fanbois?
Have you audited all the firmware and software on your firewalls and routers?