Arc Welders incompatible with Broken Shackles?

[Thrakerzod]

I'm trying to start a new game with a bunch of pre-made empires spawning in and I found something that seems very odd to me. for some reason empires that have the Arc Welders origin are incompatible with empires that have the Broken Shackles origin (I even tested to make sure it wasn't some other factor by making some blank empires that were just the bare essentials+the origins) because they have "incompatible starting systems".

changing one of them from the setting of "Random Trinary I" (which I noticed they both defaulted to) to "Random Trinary II" seemingly fixed the issue.

is this a bug or is there some reason or intention to this? why would those two origins be incompatible when both start in random trinary systems (specifically both trinary I)? how do origins even have incompatible starting systems? it's not like they're starting in the same one (I even made sure to go and check that I'd named the stars different names)?

[Ryika]

Random Trinary I is the name of a solar system initializer. Those initializers have to be unique, even when largely randomized.