When you UICorner to an extreme high radius so you can have the entire Frame cornered, it is suppose to produce a smooth corner but now it produces a chunky corner.
The bug happens in Studio, and was just fine a few days ago. It appears as of this morning. I have reset my entire Studio, and tested it in multiple Baseplates and even with different colors and it still produces the bug.
I have made a concept art of what it suppose to look like (top) vs what it looks like now (bottom):
https://gyazo.com/e9b6cbbc8eb1fa880c00bdc8263f9875
Here is the bug in Studio: https://gyazo.com/e0f02d248c5c94e7f513a3ea75d0acc5
Both of these elements are Frames with a UICorner of 0.5,0 (tried it with 0,350 also).
My Mac Specs:
https://gyazo.com/7fd0fba7d1cc526aef0cce52704d92b2