I'm guessing here with no hard sources to go on.
But were these bunkers forward- or enfilade-firing ?
For instance, very similar bunkers can be seen at Omaha Beach : they are built into the dunes and angled to fire along the beach, not directly forward. The extended wall you mention thus acts , not to restrict the field of fire of its' own armament, but to protect the embrasure from fire coming from the most likely area ie in front.
As I said, this is only my own thinking so could well be wrong ! For sure there's a good reason, though. No doubt about it, in both World Wars the Germans were world champion bunker builders !
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