EWR Sites not affected by unit emission off

I am attempting to control EWR site emissions via trigger, and they do not turn off for the "Unit Emission Off" action. Presumably the same issue occurs for "Unit Emission On," but since I cannot turn emissions off I am unable to test.

However, it is possible to turn off the EWR site off with the action "Unit AI Off."

My attached mission describes these triggers with messages. A search radar and an EWR are placed ahead. Emission Off is sent to both units and only the search radar turns off. A few second later, Emission On is sent and the search radar turns back on.

Then Unit AI Off is sent and both sites go dark. Unit AI On is sent later and both turn back on.

EWR_Emission_Bug.miz