Hi so I use this with High Tech Laboratory Facility mod and they don't work together. I take a look into your code and find that in the patch operation, you use xpath with hard-coded value in it:
Doing it this way can easily breaks your mod since other mod may modify the xml, just like High Tech Laboratory Facility mod does, and hard-coded value will no longer work.
My fix is that instead of using current xpath, you can have your xpath like this:
This xpath means that it will target every linkableFacilities tags under ThingDef (every descendants, not limited to direct children). So that you eliminate the usage of hard-coded value like li[3] and make the code more flexible.