There are no events published to event_records table when observations are edited from bacteriology display control. It is observed that the API used to update bacteriology observations from the display control is different from the API used to save from the consultation page.
API used in consultation page(encounter data) where events are raised: https://192.168.33.10/openmrs/ws/rest/v1/bahmnicore/bahmniencounter
API used when bacteriology obs updated from bacteriology display control: https://192.168.33.10/openmrs/ws/rest/v1/specimen
Looks like above(the second one) API is not generating events.
It is better to use the same API (bahmniencounter) even in display-control since other display controls also work in same way (eg: obs, edit forms) also it generates events.