You can currently use the bunny hop engine to smuggle items into cargo-locked planets. Please add the following logic to the bunny hop code to prevent hopping to currently locked planets.

local cargo_lock_name = “planetslib-“ .. planet_name .. “-cargo-drops”
if prototypes.technology[cargo_lock_name] and not player.force.technologies[cargo_lock_name].researched then
CANCEL_HOP

I do not recommend manually blacklisting planets, as it is overly draconian. I do not recommend blocking just the bringing of items, because that would skip Rubia’s landing cutscene and equipment checks (and at a minimum would require using Rubia’s remote interface to do more logic with the planet).

Huh, that is exactly what it does currently. Will check what's wrong later. Did this happen specifically on Rubia for you?

A user reported it to me earlier today. I can follow up with them.

Testing it myself, I got this when trying to use the bunny hop engine twice (the first use failed due to being overweight, but the UI wouldn't go away):

The mod ○ Rabbasca (0.7.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event planet-rabbasca::on_script_trigger_effect (ID 173)
__planet-rabbasca__/bunnyhop.lua:65: attempt to index local 'player' (a nil value)
stack traceback:
    __planet-rabbasca__/bunnyhop.lua:65: in function 'clear_bunnyhop_ui'
    __planet-rabbasca__/bunnyhop.lua:199: in function 'show_bunnyhop_ui'
    __planet-rabbasca__/control.lua:70: in function <__planet-rabbasca__/control.lua:6>

I can confirm that Rubia disappears from the UI tho, when the cargo lock tech is not researched. So something must have been wrong when the user reported it to me. My apologies.

Can not reproduce it on my side too, happy to take a closer look though with more info. This crash will be fixed with 0.7.2.

It was reported by Samario on your channel on the Foundry discord. He should have more information.