Collision Hitbox shrinks when sprite selected with mouse?

[griffpatch]

Expected Behavior

Hitbox stays the same when you select a sprite in the editor

Actual Behavior

Hitbox appears to shrink?

Steps to Reproduce

See: https://llk.github.io/scratch-gui/develop/#298267285

Play the project then "click on sprite2" in the editor
The point of collision with sprite1 changes.
Pressing green flag resets it again
Also pressing space to change the costume of sprite 2 also resets it.

Operating System and Browser

Chrome on Windows PC

[Kenny2github]

Cannot reproduce on Chrome 73.0.3683.86 Windows 10.0.17763.379

[griffpatch]

Interesting - here it is on Windows 10 Chrome 73.0.3683.86 (Official Build) (64-bit)

[Kenny2github]

Oh, yes, now I can reproduce it. (The project didn't work that way when I tried the first time!).