When placing overlays manually over board elements they don’t appear in the correct position.
The more offset there is to the origin of the document the larger an extra offset is applied to the overlay.
This makes it very hard to position overlays manually and make them appear at the right position in view mode.
Here are screenshots of progressively moving the button (circle) and its manually placed overlay (square) away from the origin. Circle and square touch each other on the left, but not on the right.
I think this is a bug. Please let me know a workaround if it isn’t 
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