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I created a CRS based on a State Plane and added a +k_0 parameter in order to make measured dimensions fit ground references in my images.
After entering the first line segment, I wanted to adjust the endpoints with the Vertex Tool. I could not "grab" by clicking on either the endpoint, nor the line segment.

When I tested by switching the CRS of the layer back to the state plane (the line naturally jumped to a new part of the map), the Vertex Tool was able to select and modify the line endpoints.

It looks like the Vertex Tool is not considering the scaling (+k_0) parameter. I tested with the deprecated +k parameter, and got the same results.

I ran a little experiment to see if it was only the scaling that was missing for the Vertex Tool
Layer 1 is in the scaled CRS
Layer 2 is a copy of that layer, same CRS minus the scaling.

Layer 2, naturally is displaced on the map. If activate Layer 1, and hover the Vertex Tool over where the line shows up in Layer 2, IT HIGHLIGHTS points on the Layer 1 location.

That is to say, the Vertex Tool "finds" the feature according to the non-scaled version of the CRS, but displays the highlights using the scaling.

There is another CRS with scaling bug that occurs when saving a layer, which I will file a separate bug report for.
This is my first bug report, so please let me know if I need to do anything differently. Will be happy to provide more information.
Keith
[email protected]