I can move things in a fully constrained sketch
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The collinear constrained seems to only constrain parallel. The sketch is fully locked, Sketch.ShowUnderconstrained says "Sketch is fully constrained!" but I can still move the middle line.
Grab it by the blue point and drag around. This thing is not collinear at all.
Also, the Get Support link in the menu gives a 404 on the website.