Apologies for the delay in getting back to you on this.
Actually, this behaviour has always been the case from version 1.0!
The idea is that the tool only draws
convex shapes. That is because most objects for which the lasso tool is used (stars, galaxies, globs, planetary nebula, dust donuts etc.) tend to be are spherical or elleptical in nature. This is almost always to due the nature of the physics governing the appearance of such objects (gravity, emissions, explosions, Airy disc/diffraction etc.).
Cases of contiguous masks with
concave features are quite rare, unless you engage in truly arbitrary mask creation, which, though possible, is usually not appropriate if documentary photography is the goal.
I hope this helps & makse sense!
