Gold is not a "number", so you have to start reading from the other side.
Normally resistors never ever start with black (Zero) because it's much more logical to shift the exponent ring.
See
this thread.
A multiplier of 0.001 has only been standardized in 2016; earlier resistors with 3 significant digits were coded with leading zero if necessary.
What I haven't seen before is a resistor with 5% tolerance and three significant digits - typically they only have two.
AC-M6-POW-XR seems to be a common PCB on Aliexpress, etc. Here's a pic with a resistor from a different manufacturer. Again, it has that odd color code:
(0.18 Ohms 1%)
This looks like ordinary 0.18Ω 1% with 3 digit code. I have seen similar resistors and so have others in the thread I linked.
Thanks for your advice, I'll make sure to check the FET and other components as you mentioned.
The underside of the board seems to have heat marks.
Yep, it was connected between the FET and the negative rail. That's the current sense resistor and sub-1Ω values are usual here.
AFAIK in flyback converters the exact value isn't even critical and it can be higher, only power output will be reduced proportionally.
What must not be done is installing a lower value; this may cause transformer saturation and another short circuit through the FET.
Check if the FET isn't shorted (but it probably is), check D27 and nearby resistors.
Identify the SO8 chip and check if it doesn't have shorts to ground on pins such as FET drive output or current sense.
edit
What's the TO92 device near this resistor, it looks unusual.
It should be suspect too if it has connections with the blown resistor.