Why dynamic arrays in a struct crash when they are effectively at 8 byte align, but precceeded with align(1)?

[realhet]

Hi,

Good:
```d
struct WorkorderNode[]
align(1):
ThingId thingId;

bool opened; ubyte[3] dummy;
align(8):
WorkorderNode[] subNodes;
```

Bad:
```d
struct WorkorderNode[]
align(1):
ThingId thingId;

bool opened; ubyte[3] dummy;
align(4/*!!!!!!!!!!*/):
WorkorderNode[] subNodes;
```

The struct's footprint is the same, yet it requires default 
align: or align(n) at least 8.
Are there any official requirements for these fap pointers?
(Win32 64bit LDC)