UPDATE 2022-06-22
Issue has become more noticeable in corrected amps. Example:
22A-211.sb41331182.eb41830205.59730.99877748842
ea01 is the black stuff at the low end
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C:A0C0 and C:A1C1, amp solution bumps, possibly as early as Jan 07, persists through B, BnA, A
uncertain if same cause in 3bit and 8bit. examples of both are here:
/lustre/aoc/projects/srdp/problem_data/ea01_AC/
8bit:
3bit: