Doh! Nonononono, it's an unfortunate similarity between the spot name and the condition:
6D18 = six double 1/8" spots, the pattern has six sets of two 1/8" spots, where the spots in each set are together:
View attachment 1105018
6D
S18 = six double
split 1/8" spots - the pattern has six sets of two 1/8" spots, where the spots in each set have a space between them:
View attachment 1105019
I'm going to refer to the spot as "double spaced" going forward lol. There were no issues with split spots (where a split shows on the edge of the chip) on the chips I was referring to.
And guys - it's 3/16" spots, not 1/6". My engineer brain is twitching here lol