Variable length strings in deeply nested UDTs are not initialised

[flukiluke]

The following program crashes with a segmentation fault on the last line:

Type t1
    a As String
End Type

Type t2
    b As t1
    s As String
End Type

Type t3
    n As Long
    c As t2
End Type

Dim test As t3

Print test.c.s 'OK
Print test.c.b.a 'Segmentation fault

Initially observed at https://qb64phoenix.com/forum/showthread.php?tid=2889

Reproduced on Linux, commit 35d901f. At a glance the bad pointer looks to be the high 4 bytes of a valid pointer shifted down, so I suspect a misaligned store in the initialisation.