Actions with 'Event acknowledged = Ack' Operation not working

[klaauser]

A while ago (~6 months) I created an Action that would email a User Group when an event had been acknowledged.

Here's the Action Configuration:
Conditions:

• Time period: in 1-7,00:00-24:00 (Note that I have tried NO Conditions as well as specifically naming a trigger - same result)

Operations:

• Default operation step duration: 60 (Note I have tried various ranges including 600 and 3600)
• Steps: 1-1 (Note I have tried 1-10 and 1-0)
• Operation Type: Send Message
• Send to User groups: %GroupName% (Note I have tried sending to individual Users as well)
• Send only to: Basic HTML Email (I have an SH script that send an HTML formatted email. Note I have tried Basic Email as well)
• Default message: unchecked
• Conditions: Event acknowledged = Ack

When I first created this Action, it worked. I am not sure if it was an OS update, a Zabbix update, or some update-unrelated change that stopped this from working, but this Action is no longer firing.

Environment

• CentOS 7
• Zabbix 3.2.4 (Although this issue was present in previous versions as well)

[klaauser]

Note that I just got a reply from one of the developers working on Zabbix, apparently this feature isn't supported at all and the fact that I got it working in the past is a total fluke. It's slated for the 3.4 release though.
If anyone has any suggestions about how to get a hack of this setup working I'd much appreciate it.