System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.86

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Worked: (optional)

Short description of error
[Please fill out a short description of the error here]

The Border Rendering ignores the Compositing when Render an animation. (ctrl f12)

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

Make a Border-Render (ctrl. B) and then hit render. In the compositing use a "Alpha over"- node
and put the Render-Node in the under socket. In the compositing you see, the Border-Render over
the color you choosed in the Alpah-over-node. But when you want to render the animation, in the
output will be everything black (no alpha) or white (with alpha) beside the border-render-part of the image.
The compositing gets clearly ignored when rendering an animation.