r358503 breaks reroot

As of r358503, *reboot -r* no longer works for me.
This is only tested on amd64.

I produced a vanilla mini-memstick image each for r358502 and r358503.
I booted each in bhyve in single user mode and ran *reboot -r*.
The first works as expected, the second halts with:

kern_symlink /dev -> / returns 20

Images (to be deleted when this is resolved):
* https://club.bisd.ro/site/uv/FreeBSD-13.0-CURRENT-amd64-r358502.img
* https://club.bisd.ro/site/uv/FreeBSD-13.0-CURRENT-amd64-r358503.img

SHA1 checksums (via https://club.bisd.ro/site/uvlist):
* r358502 - c968c4a71c270561c1b0a02e2b2281cbbf8787d7
* r358503 - b5d1abd6b3f3e009c2b54198d76d71a8640807a6

External bhyve commands:
* sh /usr/share/examples/bhyve/vmrun.sh -c 1 -m 1024M -d 
/mnt/FreeBSD-13.0-CURRENT-amd64-r358502.img reroot
* sh /usr/share/examples/bhyve/vmrun.sh -c 1 -m 1024M -d 
/mnt/FreeBSD-13.0-CURRENT-amd64-r358503.img reroot

Internal bhyve commands:
1. Press 2 for single user mode.
2. When prompted, press Return.
3. Issue command: reboot -r

To exit the first case:
1. Press Return.
2. Select Shell.
3. Issue command: shutdown -p now

To exit the second case, issue the following command in a second terminal:
bhyvectl --destroy --vm=reroot

Any suggested workarounds besides reverting to r358502?

Any help appreciated,
Ross