Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 382.05
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-22 23:57, hash: rBe7a0f0a9934e
Short description of error
Saving .blend file when render result (or other image) is shown in image editor,
and do zooming or other manupulation in image editor, the render result disappears.
Exact steps for others to reproduce the error
The attached .blend file has 3D view port panel and Image Editor showing Render Result.
Render the scene, and the Render Result will be shown in Image Editor.
(Display mode for render was set to "Image Editor")
Then save the project with Ctrl-S. The render result is still shown at this moment.
However, when you do any manupulation on the image editor, the render result disappears.
(Re-selecting the Render Result in the editor recovers the image.
So that this may be not so serious, but can be annoying)