Hi Phil,
When you dump Makernotes 0x0003 and CameraIFD 0x3300
with Exiftool, you can see the fixed relation between their values.
CameraIFD works with this table here:
0 = Auto
1 = Daylight
2 = Cloudy
3 = Tungsten
4 = n/a
5 = Flash
6 = n/a
7 = n/a
8 = Custom#1
9 = Custom#2
10 = Custom#3
11 = Custom#4
12 = Shade
13 = Kelvin
...
16 = new AWBc at least in GH5 and G9 (Makernotes WB==19)
Tag 0x3300 is the Whitebalance you have set.
Tag 0x3600 looks like the Whitebalance camera has detected.
greetings from Germany
-Klaus
Thanks!
- Phil
Edit: More information on this tag in this thread (https://exiftool.org/forum/index.php/topic,9296.new.html#new)