@MeJebus
I think I had the same problem with the same devices which had been working as I expected for quite some time until I performed some updates including the Zigbee2MQTT which has two of my E1734 switches on it (incidentally I have a E1734 on another Zigbee2MQTT instance which was not upgraded and this continued to work).
The failing E1734’s are on a Zigbee2MQTT with the following levels
Zigbee2MQTT version 2.0.0 commit: unknown
Coordinator type EZSP v7
Coordinator revision 6.5.0.0 build 188
zigbee-herdsman-converters version 21.12.0
zigbee-herdsman version 3.2.1
I can see that the Action entities for the devices have disappeared, and are not appearing in the Discovery messages for the devices, although the devices are still publishing on the Action topic.
The way I “fixed” this is to go into the Zigbee2MQTT addon and set the Legacy Action Sensors tickbox
I’m a little concerned that the documentation shows that Actions are deprecated, however I’m not 100% certain what I’m supposed to use instead. I’m currently using Node-Red. Hopefully all will become clearer before Actions are completely removed.
@speedypidz Since the option I checked is consistant with the function I needed to restore (and that Actions are marked as deprecated), I assume that what I experienced was intentional, and not a bug so I didn’t raise an issue.
I was doing the same for the buttons that control our bedroom lamps, and they stopped working after I applied the Z2M update without realizing it would have breaking changes.
I swapped the event node for an Z2M node, which I think may be an add-on and all is working well. ymmv, but you could try that node, or the “MQTT in” node under the Network section.