Potential Bug: Camera lens length reset.
When switching FROM parallel TO perspective projection in the Properties Tab> Viewport>projection drop down, the lens length of the camera sets to an arbitrary very small value…in some cases below 1.0.
If the action is repeated the lens length gets progressively shorter after each repetition.
See Video:
Also, there is similar behavior when using the snappy toggle of ctrl+shift+ RMB to toggle between an locked parallel projection of locked right, left, top, front, etc, etc, views. I use the feature in my workflow a lot. and have gotten used to it, but when doing this operation the camara size in parallel locked view get extremely small and you have to zoom out to find your part, OR when you use the same key combo to snap out of it your camera may be arbitrarily far away.
I think it would be better if the lens length was consistent when switching news like this; that when you enter your locked parallel view, the diagonal of the camera lens (The field of view/lens angle) stays the same gong back and forth.
See Video:
Not sure if this is the intended behavior or not.