As I explained on the github issue, the 0.5mm thin wall is 0.25mm in reality. Putting your shell thickness to 0.5, will make Cura put down 0.25mm lines, which it can put in inside the 0.25mm wall. That the thin wall is ignored is by design.
What IS fixed, if if you have a 1mm thick wall, then there used to be no infill inside. Now there is, which solves a lot of issues for the "mechanical prints" people.
The print button is an issue. I've put a fix in place.
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derrickoswald 0
The "no output" problem goes away with wall thicknesses of 0.5 mm (with a 0.4 mm nozzle size). It actually generates very good geometry in these cases, but suffers from apparently random connections between LayerParts leading to unnecessary stringing.
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