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A reboot of the VM resolved the issue for me. The unassigned interface now does not set any IPv6 addresses anymore.

Not quite intuitive, but it seems like this situation is not clearly reproducible by other. Hence it may be some weirdness appearing in my specific setup....

Thank you for your confirmation that this is not an expected behavior.

Agree - please file an issue on Github.

Issue created: https://github.com/opnsense/core/issues/8110

Reading your previous post I assumed you want to run VLANs over that port? So while that problem is not fixed in OPNsense you can configure around it by not allowing untagged traffic on that port.

Yes, actually I want to run an VLAN on top of this interface. But since this issue currently ruins my routing table I'll need to wait until it is fixed.

It is currently a "simple" interface, which is not assigned or configured. It has a link to a LAN where lots of ordinary untagged LAN traffic is going on. On the LAN is another router which does to RAs and provides the SLAAC prefix information.
Leaving all the thoughts about VLANs out of the story for now: why does a "not assigned" (and thus deactivated) interface react on RA packages?
When I read "deactivated" in the interface listing, I expect it to be inactive and quiet.

See the interface list in the attachment. I'm talking about interface `vtnet0`.

Thanks for your reply.
I'm sorry to not be clear enough: I want the parent interface to be disabled and not have an IPv6 address assigned. It's important for routing reasons that the parent interface does not get an global address assigned via slaac. But I can't figure out how to prevent this.
Also currently i deleted the vlan interface for testing. But either way the parent interface receives IPv6 addresses. I want to make this auto-assignment stop.

Hello!

I've a not-assgined, disabled interface which is connected to a network (link up). Even though it's disabled it gets IPv6 addresses assigned (link-local and global via slaac).
How can I prevent this behavior?

Is it possible to run an active VLAN interface on top of this disabled interface?