A redstone signal will be cut off in a scenario where after running over scaffolding the signal path drops down 1 block. After that the signal strength will always be 0.

The same setup is working as expected when using a stone block instead of the scaffolding.

In the screenshot I have chosen to go around the corner to illustrate that the connection is indicated by the top redstone going around the corner. The same happens though when you do not go around the corner.