Hi,
Just FYI, or maybe the documentation is not up-to-date, but I ran into the following:
In a comment triggered automation, I wanted to test whether a comment is internal or customer reply. Usually it's done with {{comment.internal}} as the documentation suggests.
However, the automation editor lists {{comment.isInternal}} as a compatible value.

To double check, I checked with Atlassian Support (AI) and the response was surprising.

So I guess I just came across something that is undocumented (yet).
The Automation rule works like a charm with {{comment.isInternal}}, as I expected.