I made a video here: Bug - YouTube
Trying to make a 0.2 cm shell on two bodies that are the same. The one on the left for some reason only works at a certain rotation? 
Out of curiosity, did you make the 3 bodies from a single one to start with?
Or, did you make one and then use Copy-Rotate to create the others?
Or, did you use the Mirror tool an any time?
I ask because I too recall having a similar issue when I used the Mirror tool.
Yeah here:
Test1.shapr (220.5 KB)
Don’t mind the first object, I sometimes just make multiple different objects for ideas
Yeah I started from one revolve and did split body. Maybe it was because the sketch itself wasn’t very geometric? I used a spline for the curve
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I partially recreated your truncated egg shape using Revolve and Split-Body from a spline sketch.
Interesting how one side I can dimension a shell wall thickness and the other cannot. The interaction of moving the Shell arrow speaks for itself.
ShellTest.shapr (16.3 KB)
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Here’s my work around.
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Yeah it’s an interesting bug to say the least haha
Sorry, can’t help myself 
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