Hey ,
While testing I noticed this issue didn’t occur in 4.13 so it has been resolved already.While this is an issue in 4.12.5 a bug report wont be necessary. The only known work around if you want to stay in 4.12.5 is to lower the render target size below 700 x 700 in the screenshot I have it set to 512 x 512.
Hope that helps,