Sweeping !54432 from master to 21.0. fix AFP pixel numbering and particle propagationCloses AFPSOFT-139

Atlas Nightlybuildrequested to merge
cherry-pick-c0a27c5d162-21.0 into 21.0

fix AFP pixel numbering and particle propagation

Closes AFPSOFT-139

See merge request !54432 (merged)

Edited by Petr Balek

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