Why some maps are not found by asset manager "asset base class" selector

I have 70 levels which are all sublevels of world map. asset manager can scan some of them but not all so asset base class selector does not show them.

as you can see in this image there must be 70 levels but in this list shows from 00 to 10 but not 11 and from 12 to 14 but not 15,16,17,18,19,20

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