Can't access some allied force's buildings

[ABDHP]

I hope this is the right place to post this. Me and some friends wanted to play Factorio with diplomacy. I made a mod that automatically puts every player in their own force, and installed this mod to manage diplomatic relationships between them, along with some other mods. We decided to have everybody else as allies for a peaceful start (as in normal multiplayer).

However, we ran into issues with accessing some of each other's buildings, such as assembling machines, steam engines, electric minig drills, gun turrets and the broken spaceship (that belongs to force "player"). Other ones we've used so far work as intended (belts, inserters, burner drills, furnaces, labs, chests, boilers, power poles etc). I'm hosting the game (and playing from the same instance) and, when hovering over the said structures, no information about them appears on the right, there's no selection rectangle over the building, it can't be interacted with in any way including opening or deconstructing. As if I were hovering over empty ground.
Other players with connection delays have reported slightly different issues, with the same net result. The interaction gui and the deconstruction progress bar reset after about 0,2 seconds, and at the same time the selection rectangle and building info disappear for one tick. Nothing can be inserted or taken from the building.
Another thing I noticed is when setting force relationship to neutral or enemy makes everything work as it should, though I still can't access the buildings because, well, they're not allied buildings anymore.

This issue might be coming from some of the other mods we have installed. I will investigate by disabling some mods a little later, and give more information on whether that's the case. In any case, I don't think this is intended behaviour. I'm attaching my mod-list.json for a complete picture. The mod I made is listed as solo-forces.
Any ideas as to what may be causing this? Any help would be appreciated

[ABDHP]

Funny enough, the mod causing the problem was the diplomacy one. Not sure if it's a bug in the mod, or somehow the game itself.