NOTE: This is for the old and removed Stacked Rockets system, not the current (as of 2025) Mining Rockets

I have noticed the bug you describe. This scenario was properly working for the first few weeks at least. Maybe some game mechanics have changed since then that I have yet to familiarize with.

maybe something is outdated but when i try to launch to the standard coordinates the rocket just stays on the platform and doesn't actually lift off. Multiple times i've also fallen through the ground and out of the rocket by pressing any button during the launch. Not quite sure what the deal is there. I see some yellow text in the right corner when attempting to lift off.

Yes. Look at the 2nd screen shot. Start with F1, go to the home page of the stationpedia, find "Travel" at the bottom of the menu, scroll down and find the coordinates for all the worlds you have enabled. Any mod world you have enabled will show up with a unique coordinate. Just use the labeler to dial in the coordinate to the memory chip, which is directly written to the command module. Then go inside the command module and launch.

This is amazing! Are there coordinates for custom and modded worlds? How does it work?