If I Alt+Left Click on any loops, that are not along sharp edges, i don't have this issue. Selecting the outer edge of a singular plane works fine aswell. It's only on models like the one that's shown in the image.
The same thing happens in vertext select mode.
How can I properly select these edges without clicking them indicidually or by ctrl+left click?
Thank you very much in advance.
There is no loop in your image. You misunderstand what a loop is. See: https://docs.blender.org/manual/en/latest/modeling/meshes/selecting/loops.html
That's a loop:
You can see it ends when there are no more edge intersections where there are 4 faces around the vertex of intersection. Kind of hard to explain, but when you get it, it's very intuitive.
One more example:
The loop ends at the corner in the first one, but the second one has edges marked in red, so the loop continues.
The topology must be a grid of faces and then the edges defining the grid are loops, but only the topology is important here, it can be in any shape or form in 3d space.
