i think it's a good idea to explore all the bugs in one thread and we keep updating them with each beta version released. i found out the following
1- media storage bug
2- Whatsapp not sharing pics from gallery ( only from attachment inside whatsapp)
3- home menu is a bit laggy - drop the resolution to fhd+ solve the lag for now
4- nova launcher doesn't work properly with the new gestures
5- cant find screen on time in the new device care menu
6- Andrdoi PAY/Bank Can't use(CTS profile match :fail)
7- Some times the clock widget does not appear on the lockscreen.
8- Smart reply doesn't work on WhatsApp and on telegram
9- videos not displaying in the Samsung Video app
10- Twitter app sometime freeze and not responsive
if you have more please share so we can update the list ..