I propose an unofficial update to B42.
Hopefully we have some RV Interior fans with knowledge of PZ Coding to assist?
So far I have managed to update the structure to B42, identify 4 errors (https://imgur.com/a/Jd7HHot) that can be removed to continue debugging but yet when using the command the player does not teleport to the interior and when teleporting manually to the set coords there is no generated interior.

these 2 issues appear to occur outside the LUA debugger

My next steps are as follows:
Create a building using the new map tools and replacing all map files with a repeat of this building to test if issue lies in instance generation/map compatibility
Investigate what has broken the teleportation function.

My goal is to try and at-least have this mod temporarily allow use of one RV

If anyone has any useful information please comment, I have found 2 changes so far in the patch notes which could effect this mod:

Fixed bugs when teleporting while in a vehicle, which also caused duplications and sometimes trapping players inside cars. Players will now be removed from a vehicle before being teleported.
Now any time a character in a vehicle teleports, it is funneled through one java function in IsoGameCharacter.java that will properly remove them from a vehicle.

my theory is that because of this when the mod attempts to remove the player from the vehicle it fails due to already occurring however this won't explain the debug teleport action not working

Edit - We're Live on Github
https://github.com/janger/PZB42RVInteriorCommunityProject/tree/main