Mikrotik zerotier does not see multicast packets from other routers on this interface. Other OS through Zerotier ospf successfully work with each other and see Hello Packet mikrotik. Unicast goes both ways.
I started using zerotier in mikrotik from version 7.1.1, the problem remained in v7.1.2. RB4011.

I had same kind of problem on my Mikrotik with ZeroTier setup.

But I found that the ZeroTier interface was recognized by the OSPF instance, so that it won't listen nor speak on the ZeroTier interface.

I have OSPF working on my ZT interface between two RB's.

Have you enabled "Allow Ethernet Bridging" on each zt node on zt web control panel?
after enabling it on each node, you should see on the zt interface this:

Thank you. Enabling "Allow Ethernet Bridging" fixed the OSPF issue. But Zerotier on FreeBSD and Linux does not require Bridging to be enabled. There OSPF works.