lighting changes on scene switch
When scene switching the lighting might change, going suddenly dark - or it might start off correct until you switch back to the scene - for me this has been down to the use of the skybox as an ambient source- switching it to a fixed colour (or something that isn't the default skybox) has remedied the situation. (much) Older posts have indicated that turning off continuous/auto light baking can help too, although at time of writing, Unity 2021 has no such option!