Back button in amendmend view becomes viscious circle

Describe the bug
When you enter the amendment view of an amendment to a motion through "show all amendments" and then use the top left corner back button to go back, you end up in a circle, looping between the list of amendments to motion and the amendment you just visited.

How to Reproduce

1. Create a motion.
2. Create an amendment.
3. Open the motion through the motions page.
4. Click on the link "1 Amendment" in the meta data of the motion view.
5. Click on your amendment.
6. Click on the back arrow in the top left corner. (You should now be back in the list of amendments)
7. Click on the back arrow in the top left corner,
8. You're back at the amendment view.

Expected behavior
8. You're at the motion view.
Instead of circling back and forth between amendment view and the list of amendments, I expect to get back to the higher level.

Additional context
This error has been there for a long time already, I've just not gotten to reporting it.
It links a bit to the issue #3238 for better navigation in the motions.

Reproduce the navigation flow from the motions page through the amendment list and amendment view, then inspect the back-button routing for those views. Done means the first back action returns to the amendment list and the second returns to the motion view without looping.