If in the project → User Interface add a new cursor throw the + button and press play then the engine crash.
If rename the blueprint created and go to re-select the BP then crash another time only pressing in the button list.
And no idea about how use or make a custom cursor here…
This issue has been reported and marked as already fixed within an upcoming release. Thank you for taking the time to create a post for this bug report, and let us know if you have further questions.