Menu activation leads to an assert_error

[evgaster]

Using the simulator on (native) Fedora; version 0.9.16.

I am experimenting with tree structured menus (to navigate a partly recursive data structure) like:

{
        { "m1"  « "m1" "Leaf action" » }
        { "m2"
                «
                        {
                                { "m2.1" « "m2.1" "Leaf action" » }
                                { "m2.2" « "m2.2" "Leaf action" » }
                        }
                        Menu
                »
        }
        { "m3"  « "m3" "Leaf Action" » }
}
Menu

When I click F1 (m1), F3 (m3) and then F2 (m2) the screen freezes in below state:

In the terminal window I see the simulator giving:

[1325855 2007.050554] assert_error: Assertion failed: index + objsize <= size

Every key clicked gives a:

[151857190598 11208.646922] keys_warning: Dropped key 33 (wr 216 rd 212)
[151860622794 11208.855024] keys_warning: Dropped key 0 (wr 216 rd 212)

I intended to get:

And then after clikcing F1 (m2.1) and F2 (m2.2):

Ok, I understand that the processing of the action of F2 is going on and it replaces the action of, among others, ... F2. But I do simular things ... where it works as intended.