i'm not sur ehow else to describe this specific bug other than a screen recording (see attached).
other than that, the new update with the Rectangle Tool was one i've waiting so long for. but everytime i start to pull at the corners of the shape, that program crashes. every time. hope to have these fixed. really gets in the way of work.
We're sorry about the trouble with Photoshop. You can try enabling the option to Deactivate Native Canvas from Photoshop by going to Preferences, then Technology Previews. Once done, quit & relaunch Photoshop to check if that helps.
If the issue persists, you can try to reset the preferences of Photoshop manually using the steps mentioned here: https://adobe.ly/2Qzc0K3