How to reproduce:
1. Open the attached project ("BorderRadiusClippingBug.zip")
2. Go to "Bug" -> "Open Window"
3. Observe the red element which is a parent of the blue element and has its overflow set to hidden
4. Click "Toggle Radius"
5. Observe the blue element

Expected result: the red element gets rounded edges and the overflow areas of the blue element that are outside of the red square are clipped
Actual result: the blue element does not get clipped at all when the parent element is updated.

NOTE: If the border radius is specified when elements are created, clipping occurs correctly

Reproduced in: 2019.3.0a3, 2019.2.0b3, 2019.2.0a12
Couldn't test with: 2019.2.0a11, 2019.1.4f1, 2018.4.1f1, 2017.4.27f1 (the editor script breaks in these versions)