om: set-errand-state doesn't seem to work with non-cf tiles

We have a tile that has a few post-deploy and pre-delete errands, as follows:

$> om ... errands -p the-tile
+--------------------+---------------------+--------------------+
|        NAME        | POST DEPLOY ENABLED | PRE DELETE ENABLED |
+--------------------+---------------------+--------------------+
| broker-registrar   | true                |                    |
| smoke-tests        | true                |                    |
| broker-deregistrar |                     | true               |
+--------------------+---------------------+--------------------+

However, trying to disable any errands with set-errand-state doesn’t do anything.

$> om ... set-errand-state -p the-tile -e broker-deregistrar --pre-delete-state disabled
$> echo $? # 0
$> om ... set-errand-state -p the-tile -e broker-registrar --post-deploy-state disabled
$> echo $? # 0
$> om ... errands -p the-tile
+--------------------+---------------------+--------------------+
|        NAME        | POST DEPLOY ENABLED | PRE DELETE ENABLED |
+--------------------+---------------------+--------------------+
| broker-registrar   | true                |                    |
| smoke-tests        | true                |                    |
| broker-deregistrar |                     | true               |
+--------------------+---------------------+--------------------+
$> ☹️

It works with om curl. Similar commands all work fine on our ERT tile. It only seems to not-work with tiles not-called “cf”

with @totherme