Golf V R32 :: Bulb Out Fault After Installing Rear Fog

Just installed a set of euro tails with rear fog (non-LED). I also have front fogs on my car. I used the following VDCS changes in Central Electronics to activate the rear fog:

Byte 3 - Bit 1 set to 1 (1 rear fog light)
Byte 3 - Bit 2 set to 1 (1 reverse driving light)
Byte 4 - Bit 6 set to 0 (Rear fog deactivated)
Byte 18 - Bit 3 set to 1 (Cold diagnose rear fog lights active)

All lights work correctly, but I still get bulb out warnings for all four fog/reverse lights, i.e.

Front Left Fog
Front Right Fog
Rear Left Fog
Rear Right Reverse

I have cleared all CECM errors and the warning light disappears, but as soon as the fog lights are used, it comes back.