Here is the crop of a shot showing the problem:
Film: EK 5222 (double XX) @250
Developer: TD-201 Two-Bath (Anchell & Troop)
Time: 3 mn. A + 3 mn. B, Continuous agitation (manual)
Tank Paterson 3-reels
scan: Epson V750
Contrast is exagerated with photoshop.
So, what hapened ?
--there are strong irregularities on the left (much less on the right !)
-- there is a kind of dark vertical line (underdeveloped ?) in the center.
I develop film since 1976 and never get that. The only difference with my usual practice is that agitation was continuous (which is said to be the best way to avoid irregularities).