During set of the Commonwealth, I saved the two NEI oil in Malaya by convoy through the South China Sea. I then began to diddle with my production, just trying to make sure that this was the default for these resources. I clicked one of the Palembang resources and it went to "Idle". Magically the Tarakan oil appeared and found its way to Manchester, yet this resource is listed as Japanese and I cannot affect it.
What's more, I can not save either of the Palembang oils. My convoys no longer show as unused and one of the Palembang oil won't let me even clear the Default and Override.
I have save files if desired. The picture shows what the oil resources look like at the start of the Commonwealth setup and what it looks like after the mystery event.

Why choose the lesser evil: Vote Cthulhu.