Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 417.71
Broken: version: 2.80 (sub 53), branch: blender2.7, commit date: 2019-04-02 19:53, hash: rBa813e259d630
Short description of error
In 2.79 the greasepencil annotations in the UV/Image editor would move with the image as you pan across the 2d canvas. They don't in 2.8. In 2.79 you could replicate that behaviour by changing Stroke Placement in the greasepencil options in the toolbar, but it's not the default. In 2.8, the annotation tool in either the UV or the Image editor doesn't have this option, not in the topbar nor the tool properties. I guess the bug is more about surfacing that option back, and making the same default.
Exact steps for others to reproduce the error
From a new file, go to the UV or Image editor and draw with the Annotation tool, either by selecting the tool in the toolbar or by holding D. Use middle mouse click to move pan the 2d view, and the annotations don't move