shutting down jails gives Lost 1 pages of memory error on console.

[Johan Hendriks]

I have just update my system to FreeBSD srv-01.thuis.local 13.0-ALPHA1 
FreeBSD 13.0-ALPHA1 #28 main-c256051-g7c7c231c1424: Mon Jan 18 14:12:01 
CET 2021 root at srv-01.thuis.local:/usr/obj/usr/src/amd64.amd64/sys/KRNL amd64

Now when i shutdown a jail i see the following appear on the console.

Stopping jails: haproxy Freed UMA keg (rtentry) was not empty (1 items). 
Lost 1 pages of memory.

regards,
Johan