Two small things as in title.
There is no stacking for carbon currently and it's a preferred fuel in bobs now due to pollution multiplier on coal.
And said pollution multiplier is missing from coal stacks which might be a bit cheaty since you can stack coal to make it not pollute more.

Carbon is noted (are coke pellets Angel's only?), the pollution modifier has to be fixed in deadlock's (I don't even touch vanilla items, and only register B&A's through the stacking and crating API, not by creating data items directly).

I'm playing without Angel's and there are no coke pellets.
I'll post about pollution multiplier on Deadlock's side.

Release notes say that carbon is added but it can't be stacked still.
I'm using only bob's mods - you have solid-carbon added as item but it's not in bob's mods set. Actual item is named carbon.

I have to admit I only tested with angel's, and I wasn't aware that the item name for carbon changes. I'll add it in the next release, and I guess I'll have to look at other items then, too, like resin... :/

After todays update of bob's carbon stacks lost their fuel value.
No idea what changed really.. any chance you could take a look?
Full set of bobs no angel's.

Still happening? In my quick test with Angels, if I read the game correctly, a stack of carbon only has 3MJ of fuel value, that doesn't seem right.

I did not test recently - I had trouble getting carbon stack to be created few weeks ago when using bob's only. I did not check after recent upgrades of stacking mod.