Woomerang Launchpad Ladder
There is a problem with the ladder at the Woomerang launch pad. It has no collider (you can walk right through it) and it is not climbable.
The spawnable launchpads from MH do not have this issue, as their ladder does have a collider and is climbable.
Here you can see I have spawned a 2nd lanchpad at Woomerang and am able to interact with the ladder as expected (you see the [F]: Grab prompt). You can also see when I walk up to the standard Woomerang launchpad, interaction is impossible and there is no prompt.