There is an instance where using the comb on a grid with multiple types of poles, that there will be a complete disconnect between two sections.

Repo Setup:
Place two Big Poles max distance horizontally, a Substation directly next to the left Big Pole, a Medium Pole max distance from the Substation to it's right.

The bottoms of the poles must align horizontally

(rough visual spacing guide)

BBSS________________BB
BBSS____M___________BB

Moving the Medium Pole up one grid will prevent the disconnect bug from being tested.

It looks like there is a pull request from 5 days ago (day before the latest release) that might fix this:
https://github.com/shanemadden/factorio-power-grid-comb/pull/13

Hi there,

I was the one that helped update the mod for 2.0 and missed this bug in my initial testing scenarios.

I'll try and push for an update again.