Hi ,
do you have any progress updates on this bug? We just encountered this on our latest project, which heavily relies on having two or more interfaces attached to one actor.
The editor crashes on next start-up once the actor in question had its 2nd interface added. The error message matches the one from the original poster.
Any info at all, including possible workarounds, would be great!
EDIT:
Please note that there were no actor components involved which also implemented the two respective interfaces, though there is a component which implements another third interface.