Can confirm. I was one of the people who posted in the above mentioned threads.
I've just upgraded from a Milhouse build to LibreELEC 7.0.0 and the problem is back again. Same as before, Kodi can be seen registering a "Hat" and this is why each button press is registered twice. Kodi on Ubuntu registers 0 hats for the exact same controller and works fine.
23:12:07 T:139790187358272 NOTICE: Enabled Joystick: Xbox 360 Wireless Receiver
23:12:07 T:139790187358272 NOTICE: Details: Total Axis: 6 Total Hats: 1 Total Buttons: 15
Switched to Milhouse build #0515 and the controller is working fine again.
Won't be fixed, kodi 17 has a totally new input system and the changes are to big to be back ported, so you'll have to use devel builds or just make due for now.