Thanks for making a minimal .capx, it's much easier this way.
I'm not sure why this worked in r126. Your events look wrong.
The event "Blue: pick instance with UID BlueHP.Pin.PinnedUID" should never have worked, but I guess it depended on the implementation details of 'pick by UID' which we changed recently. Add 'for each BlueHP' above it and it works. Since I don't really want to change 'Pick by UID' back to how it used to work (it's much faster now) I think the best thing to do is change your project; hopefully just adding a few 'for each' conditions will fix it.