GC and void[N] in struct

[vit via Digitalmars-d-learn]

Hello,
I have this struct:

struct S{
    uint kind;
    void[N] data_;
}

Instances of struct S are allocated by standard GC new and 
S.data_ can contain pointers/ranges to GC allocated data.
If is GC disabled then  program run fine. But when is GC enabled 
then it fail randomly.

If the definition of S look like this:

struct S{
    void[N] data_;
    uint kind;
}

then program run fine with GC.enable.

Whats the problem? Something with alignment?