Right click functionality in screen sharing was broken
Somewhere around Catalina Apple broke right click mouse behavior in Screen Sharing.
Previous behavior would let you hold down the right mouse button while moving the mouse.
Current functionality is when you press the mouse button it disappears.
This makes it impossible to control any kind of applications that depend on mouse coordinates while the button is depressed. E.g, a House rendering program that lets you view the 3D coordinates by aligning the camera angle to the mouse movement.
This is a huge breaking change and I hope Apple can get this fixed.