You're right. After a few more searches, I found MC-37839.
I'll add my findings to that issue. This one can be closed.
First of all, you can't do a debug crash when you're in a menu.
And second, as I said before, everything needed has been provided.
I could provide thread or heap dumps, but none of that is of any use here.
@Sonicwave
I don't see why that would be necessary.
All information the devs need has been provided.
Yes, GUI size is set to automatic
This problem also occurs in the controls menu.
And it's still around in Minecraft 1.8.1-pre4.
See also MC-74172.