It’s not a bug in LayOut. Your LO file use Last saved SketchUp view as the “scene” and you have it modified. Do it correctly. Create a scene in SketchUp that shows the dashed layer visible and set the viewport to show that scene.
as for the layer being turned off, how did you create that layer? Did you use an extension? I see the same behavior with your dashes layer. I deleted that layer and made one in the normal way via the Layers panel and the layer visibility doesn’t change when creating a new scene unless I specifically change it.
When you create a modified scene in LayOut, you are telling LayOut to ignore scene-specific changes you might make in the SketchUp file. Layer visibility is scene specific as is the camera position, style, shadow, section and fog display, etc. Correct practice is to set up scenes in SketchUp that show the model the way you need to see it in LayOut. Then do not modify the scenes in LO. If you need to make changes, go back to the SketchUp file, make the changes, update the scenes as appropriate and then update the reference in LO.