The OP's burning bush is a very nice inking oddity.
I believe the black is missing on the EFO
Uh, no. Colors are only dark blue, red, and green.
Agreed, the Giori colors don't always print where intended. There was a thread last year about the whooping cranes on Scott 1098, Wildlife Conservation issues of 1957.
Just a few 1338's I found handy, note the inking of the red/blue of the stripes and stars. The red is just into the top of the wording and denomination on the 3rd stamp. Although not obvious here, the break between the blue White House and the surrounding greenery is quite variable on this issue.