airbase-ng: duplicate packets when setting MAC address

Hi,

Thanks for aircrack-ng. Super cool stuff. Image may be NSFW.
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I'll jump straight to my issue... As part of my pentesting course I've been trying to set up an evil twin AP using Linux 4.2.0-27 (Ubuntu), airbase-ng (1.2b4) and a TP-LINK TL-WN722N USB device (ath9 dri...