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Hello! Beginner here 
I'm trying to set occlusion polygons in an autotile.
However it seems not allowed to set multiple polygons in the same tile.
Am i doing it wrong ? is it a bug ? Or this is just not possible?
How manage multiple occlusion polygons in autotile ?
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In a quick test in 3.4 I can create multiple colliders within a tileset/tile but only the first one is selected(and can't seem to select the others). Occlusion, yeah seems that only one can be had.
Your best bet is to perhaps go with a smaller tile size and have each such tile have 1 wall/occluder.
Megalomaniak
Very strange that this feature does not exist, because this recommended tiles pattern i saw in some forums contains walls in tile :
How do you think people manage this issue? Do they all cut tiles as you said, to avoid multiple polygons,
or they just don't use autotile occlusion, and do it in the 'noding' way ?
Anyway, i will do as you suggested, thank you for your answer!
I honestly don't do much with 2D so I might simply be ignorant to the best solution in here, but I did offer my best guess as to how I'd approach it simply so you'd at least have some answer here. Hopefully those here with more 2D experience can and will offer further feedback.
I'm not sure about autotiles. But with normal tilesets you can create as many collision shapes as you want. You just have to click on the arrows on top of the tileset editor (on the right of the edit button) and it will switch between the shapes.
cybereality
Exactly, that's why i thought it was strange to not be able to do it for occlusion selections (Multiple collision polygons work fine in autotile).
After some investigation, i didn't find anything about that. Asking posts on forums stay with no answer.
I have the impression that this subject is somewhat forbidden o_o
More seriously i found this post that nearly answer the question, i let the link here to help other investigating people:
Reddit