My science ships don't upgrade their engine, they still use the bug fixer JD. Shouldn't this been excluded? Probably other mods may interfere. So, I do have the warp drive, but am still able to fly the hyperlanes with unarmed ships.

This engine (bug fixer) is available to both warp and hyperdrive, this is the mechanics of the game I can't do anything. Without this fixer, the game crashes because it's hard for the paradox engine to understand that the player's ship doesn't have access to hyperlines. Use mods as Paramilitary civilian ships or Modifiable blueprints for civilian ships. I'm trying to fix it, but I'm afraid it's not possible...

the above mods fix this problem

Ok, thx the fast answer. Will take a look on those mods.

BTW, I'm planning to mix your mod with reborn pre-FTL. Do you know a way to prevent ships to slip out of the core system box with warp drive? I guess your mod will just open the door...

I don't know, test and you will see

As you might guess, it isn't working. Those engines are all capable to exit the core system, no matter you have pre-FTL active.

However, thank you for including the unarmed ship designer with your mod.

Now, ti's possible this might be a mod conflict, but I'm pretty sure the mod in question just reused either a wormhole or a gateway, so I'm assuming the problem still holds, but my ships can't go through this rift from the More Events mod. I haven't tested it with wormholes or gateways yet, but seeing as switching the fleets over to jump drives fixed the problem, and my civilian ships were perfectly capable of going through, it's definitely an issue with the warp drives.