Operating system: Windows 10
Graphics card: Nvidia GeForce 1080
Broken: 2.80, 2019-01-11
Short description of error
The armature doesn't show up anymore despite being set to visible and all bone Layers being active.
The original instances of the objects that are emitted from the particle systems in the scene are rendered despite being set to "not visible". If you disable the original instances of the particles for rendering, the emitted objects won't be rendered as well. So there is no way of having objects/collections being emitted without their original instances showing up as well.
Exact steps for others to reproduce the error
I have no idea how that error with the armature occured, but for the particle error just create a particle system that emits an object/collection and then try to find a way to render out the particles without rendering the original instance of the emitted object/collection.