Main playlist is not necesseraly the appropriate one

[benoit74]

Recipe: https://farm.openzim.org/recipes/litterature-audio-poetry_fr

Playlist order in recipe: PLyorzdODa1PPVarYHnzPv9rVgYr8KCerd,PL2DQc1tA1YU1DsXe2DiLdnjw0PaHNhzT9

• PLyorzdODa1PPVarYHnzPv9rVgYr8KCerd
  • https://www.youtube.com/watch?v=9fx0zWFjL98&list=PLyorzdODa1PPVarYHnzPv9rVgYr8KCerd&index=1
  • nb videos: 2
• PL2DQc1tA1YU1DsXe2DiLdnjw0PaHNhzT9
  • https://www.youtube.com/watch?v=U4N-17xJxaE&list=PL2DQc1tA1YU1DsXe2DiLdnjw0PaHNhzT9&index=1
  • nb videos: 94

Main playlist in ZIM: PL2DQc1tA1YU1DsXe2DiLdnjw0PaHNhzT9 (Littérature, théatre, philosophie)

I strongly suspect that problem lies here where we deduplicate playlists with list(set(...)). Since set order is not guaranteed, then this operation has not order guarantee.

If I'm not mistaken, this is a (very) old bug so it can wait 3.1 to be fixed.