There is a bug — I can't select some of the elements within frames, whether I'm clicking and dragging (rectangle select), or doing the same but with cmd key pressed (on mac). If you move the frame randomly on the page some elements may become selectable again. This occurred in a pretty big project of mine (a lot of frames and pictures on the page). I cannot work further with it. How to solve it?
This one shows that it’s inside the frame and it’s not locked: