We create two paths, two bones, each of them specifying a different path limiter.
When the position of a path is changed, it affects all other paths, i.e. everything happens synchronously.
Checked the same in 4.1.24, paths work separately, as it should be.
Here is a screenshot of the test project.
For some reason the paths started working synchronously.
Thanks, very much looking forward to the solution, as I really like the physics!