broadcom driver and create_ap in Ubuntu 18.04

i have a Ubuntu 18.04 system with ASUS Wifi card which has BRCM4366 card. The card is identified fine. Now when I create an Access Point using create_ap, it comes up as an AP just fine and I can associate wifi clients to it just like any other system. I associated 2 wifi clients to it and these can ping the AP's gateway just fine - the issue is these clients cannot ping each other. It seems like there is some kind of isolation enabled in the driver that prevents these clients to ping each other.

Any tips and help are much appreciated.

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