The process lasted on from May till September with long stretches of silence (5 weeks before any feedback) which is not uncommon.
Three rounds: technical, commercial and a partner chat
Got ghosted after the partner chat without even a curtesy call or email which reflects very poorly on the process especially when it happens at this stage.
This was a newly created role at the time I was applying and it seems like either the funding or the profile of the candidate they were looking for has changed - either way there should have been communication after the partner chat about the results.