SIGSEGV introduced recently on master when deleting an inset

[Richard Kimberly Heck]

On 4/6/24 16:14, Scott Kostyshak wrote:
> To reproduce:
>
> 1. Open the attached example.
> 2. Put the cursor just after the Note inset.
> 3. Press <Backspace> twice.
>
> I get a SIGSEGV with the attached backtrace.
>
> Can anyone else reproduce on current master?

I am hoping this is not in 2.4.x and is due to the big inset merge. Can 
you check?

Riki