Found the reason for this global issue. The not working machine had not
been moved to SLAAC, as I've though it was, but had still been
configured statically.
Bummer.
As a workaround I have set default values:
net.ipv6.conf.default.stable_secret=<hex>
net.ipv6.conf.default.addr_gen_mode=2
net.ipv6.conf.all.addr_gen_mode=2
But I am getting different results on two different machines. One, where
it works even on a systemd renamed link, and one, where it is not. Still
trying to figure out, why that is.
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