@nabinhait email alerts are no longer sent on workflow state change. I reported this issue in this thread and this change could be the culprit but as i am not a developer and don’t know much code this is just conjecture. But this issue only came up after v12.5.0 which included the workflow action PR.
I have spun several test servers both on a local machine and cloud VPS with no data and tested just to be sure the issue is not with my production instance and in all cases i could replicate the issue as workflow state change does not generate emails while other email alerts such as new user creation and password reset which are automatically generated work as expected.
I honestly cannot tell why no one else has reported the issue. But i am assuming someone who uses the standard email alert feature will notice soon enough and report same. I am reporting it because i rely on it heavily and as demonstrated in this thread i cannot set up my own custom email alert to function the same way without help from community.