Sweeping !54910 from master to 21.0. fix variable name

Petr Balekrequested to merge
cherry-pick-642c2ad6-2 into 21.0

fix variable name

See merge request !54910 (merged); automatic sweep failed because !54851 (merged) (that will introduce the bug) hasn't been merged yet

(cherry picked from commit c0a27c5d)

6e003d22 fix pixel numbers, deposited charge

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