It looks like this update fixes the problem with pours on top of one another colliding, but the other bugs I described above still exist. Two ab initio recipes to demonstrate:
(a) Create a new project with a single rectangular pour. This pour fills correctly. Now turn on island removal and repour. The pour will fail.
(b) Create a new project with a single rectangular pour of size 50mm x 50mm. Open up the inspector. For a rectangular pour, the Generate Rectangle tab is selected by default, instead of the Edit Points tab. The width and height given here are incorrect: 0.250002mm has been added to each. Saving without flipping into the Edit Points tab will update the pour to use this incorrect size, corrupting the point locations.
The upshot of (b) is that you have to be super-careful to flip out of Generate Rectangle into Edit Points whenever you inspect a pour, even if you’re not changing the coordinates themselves, or you will inadvertently mess up your pour — trivial bug but inevitably infuriating if you didn’t notice and continued to make edits before realising.