I have asked the following question in the Partner Portal:
According to the documentation each tenant has access to 100 webhooks, which has been confirmed here: https://community.developer.atlassian.com/t/too-many-active-webhooks/56349
Confirmed by: Krzysztof Kercz Atlassian Staff
And by MOHANRAJ T from Atlassian Cloud Support on this issue: https://getsupport.atlassian.com/servicedesk/customer/portal/23/JST-739015
It makes no sense from a customer viewpoint that Atlassian says that you have 100 webhooks if this results in unreliable webhook delivery. Nobody can use a 100 if above 50 makes them unreliable.
Why does Atlassian say they support 100 webhooks when 50 system webhooks or more results in unreliable webhook delivery?
Link Partner Portal:
https://getsupport.atlassian.com/servicedesk/customer/portal/23/JST-740095
and Atlassian Support:
https://getsupport.atlassian.com/servicedesk/customer/portal/23/JST-739015