I usually use cmd+opt+C (ctrl+alt+C) and cmd+opt+V (ctrl+alt+V) to copy and paste properties from one object to another. It’s normal when I use it for text. But when I try this action for a frame (E.g I want to copy all properties of the frame’s background to another one), this will break all text style inside. Cry a lot 
. This same issue with section properties. Is that a bug?