First, I have a branch that creates issues and tags them with a label.
Second, I have a branch that operates on JQL where the filter is
labels in (mylabel) AND created >=-1hr
Two issues were created by the first branch, but the second branch only applies its actions to one of the issues. If I run it again, it gets the second one. Actions are to attach a form and transition the issue.
Using lookup, I can see that the filter is finding both issues so it's fine and the actions work albeit on a single issue. The problem appears to be in the second branching mechanism as it doesn't work on all issues it finds with JQL.