Well I missed to say the history tab does show the workflow execution history.
I’m able to fetch the archived workflow execution history programmatically as well with ListArchivedWorkflowExecutions.
I can confirm that the execution history was fetched from S3 itself as after deleting the execution history object from S3, the ListArchivedWorkflowExecutions stopped returning results.
The history tab exhibits weird behaviour as well,
It shows execution history not found message, but execution history is visible in the UI.
But right after that, it reloads 2 times and then I see duplicate execution history.
ex: if there are 11 events. I see 3 sets of these 11 events.
If you can confirm that this has been tested and is working at your end, I can start looking at any possible issues at my end.