Photoshop Brush tool won't create straight line while holding shift if zoom in or out

I'm used to using the brush tool extensively for masking. Often, that includes needing to mask long straight edges. To do this accurately, I often zoom in closely when placing the beginning and end of my line so that it's exact. However, over the past month or so, this has stopped working. 

Typically my process is:

- Zoom into where I want the line to begin

- Click with the brush tool on where I want the line to begin

- zoom out and scroll to where I want the line to end

- zoom into where I want the line to end

- hold down shift and click with the brush tool where I want the line to end
This should cause the first point and last point to be linked by a singular straight line. However, Photoshop has recently stopped working this way. Instead, I can now only use the straight line if it is an uninterupted -Click at the beginning, hold shift, click at the end point-. Zooming in and out seems to cause the action to break, and even while holding shift, the straight line is not created. Only two dots are created. 

I really need this to work for the effectiveness of my workflow, and is really inconventient for creating thin lines with precision. Is there a setting or something I'm missing? Or a change in function that has happened recently in PS?