Changes in NFS mounts from 14.3 to -CURRENT (almost 15)?

My overall goal is to have a FreeBSD workstation before Windows 10 dies.
That's coming up pretty quickly, so I've been testing.  Because FreeBSD's
proton support is very much dependant on 15-CURRENT, I upgraded both the
new workstation and my poudriere box to the 15-current about 2 weeks ago.

Now... normally, when the workstation boots, half a dozen NFS mounts to the
poudriere server (also fileserver) occur.  This has been the config since
... well... since back to FreeBSD 4 or so.

My workstation's fstab has lines of the form:

vr:/vr1/tmp /d/vr/tmp nfs rw,-3,-T,-l,-i,-b 0 0

'vr' being the hostname and so on.  On vr,
[2:31:331]root@vr:~> zfs get sharenfs vr1/tmp
NAME     PROPERTY  VALUE                    SOURCE
vr1/tmp  sharenfs  -maproot=nobody ump run  local

Now... for some number of upgrades, this spits out lines like "-i
deprecated, use -o intr" ... which it still does --- but then it hangs ...
for one NFS time out and it moves onto the next share.  No errors on either
the client or the server.  What's changed here?  Both machines were working
before the upgrade from 14.3 to 15-c.