Dig -x +trace?

[Mike Hodson]

I'm attempting to figure out how/why my reverse DNS delegation is broken.
I've already deleted systemd-resolved's temporary resolv.conf and added in
an immutable single line
nameserver 1.1.1.1
resolv.conf.

I can dig +trace forward hostnames fine.
I cannot dig -x an ip +trace.
All I get is the root-servers instead of any sort of reverse looking up
happening at all.
What am I doing wrong?

Thanks,

Mike

$ dig -x 208.x.x.x +trace

; <<>> DiG 9.18.1-1ubuntu1.1-Ubuntu <<>> -x 208.x.x.x +trace
;; global options: +cmd
.                       509855  IN      NS      a.root-servers.net.
.                       509855  IN      NS      b.root-servers.net.
.                       509855  IN      NS      c.root-servers.net.
.                       509855  IN      NS      d.root-servers.net.
.                       509855  IN      NS      e.root-servers.net.
.                       509855  IN      NS      f.root-servers.net.
.                       509855  IN      NS      g.root-servers.net.
.                       509855  IN      NS      h.root-servers.net.
.                       509855  IN      NS      i.root-servers.net.
.                       509855  IN      NS      j.root-servers.net.
.                       509855  IN      NS      k.root-servers.net.
.                       509855  IN      NS      l.root-servers.net.
.                       509855  IN      NS      m.root-servers.net.
.                       509855  IN      RRSIG   NS 8 0 518400
20221012170000 20220929160000 20826 .
FkcsBmNz2oK02ARhYfNSfxbnEL93RITDteQtHQoPn8zHZg9B6BRXqkH9
+UpAEViDraX+4l8YJiUvYzrHh9twpQry0vv7xgDLoDdU9kRqokG5DEoq
Ueqph6qleC6Vylga4f1MzW
N+Dh9zK9/eCSp6WxwgbnW53a9GMDbI5KWZ
WkcWw3IPHVvVwDZfWhrKJtKZ3hafsGgmigm9F01Xk17prOAS6jBbvYjT
jCUyTl3UZJ+bAKS4tkpFdjp78raxBKBQPN6TzdLjtxYQrhriZZ3Gjdcg
dT+WQkLGYuyeakm2JqVe9vXGMGn0XkZEGMYnh7iW80N1XHyBMfhzGO+s 61zvWA==
;; Received 1097 bytes from 1.1.1.1#53(1.1.1.1) in 12 ms
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