I do not know your setup in detail but I guess your setup will not allow that the first vmbr can discover your veth.
After a time switches will forget the MAC of the ports if they are not used anymore.
And if the switch can not find it the traffic will dropped.
If you be active you send...
this happens if the copies are different and have not the same snapshots.
You can compare snapshots with this command
zfs send rpool/data/subvol-705-disk-1@__replicate_705-0_1600869659__ | zstreamdump
Also, compare the snapshots on both sides with list
Udo do you use an IPERC on this server if yes can you tell me which one it is.
Maybe it is related to the Disk IO devices.
We have here no such problems with EPYC CPUs.
Also, your storage config is interesting.
Proxmox VE is made for enterprise use.
Bluetooth is not part of such environments and so we ship not this kind of drivers.
Please search in this forum for "Intel wifi install". There are many threads about this topic.