Hello, 
I have been racking my brain to find a solution to this and cant seem to find any consistent solution.

On our drawing we have a series of drawing blocks, which include 3rd angle projection, revision history and multiple more. In the drawing template I have created a "Construction" layer which is normally hidden in the layer properties and is used for all construction lines. This includes any construction lines in any blocks and the title block.

When I create the block in the drawing and toggle the layer visibility all lines on the construction layer turn on and off as expected, including within the block.

I then save the block externally to be used in the design library, and once re-inserted into the drawing the visibility of the construction layer no longer toggles with the layer properties.

Any help would be greatly appreciated.

Thanks!

Solidworks 2020, SP5