I've set up a super simple automation, with a manual trigger, to clone a card to another board. The automation works completely fine when the card being cloned doesn't have a parent.
If there is a parent card, however, the automation comes back with the error message "Error creating issue, Bad Request (400)".
I've tried this on another board, also cloning to a completely different board, and the same thing happened. I believe Jira recently changed epics/parent cards slightly, and I'm wondering if that could be contributing to this. I've never come across this issue before.
There are also a couple of people who have recently commented about a similar issue here.