I believe you can moderate a community on/from another instance, so it would be logical if, when agreeing to mutually follow each other, they also agreed to add mods from the reciprocating community?
The Reddit example could have worked the same, but the sub due to scale the equation is different and the benefit of the increased community size is less and the Reddit mods would likely see little benefit Vs the dilution of mod status.
Unity: Disappointed to discover denying access to a document with legal standing to the affected parties could have legal implications, and now trying to make up a cover story.
There fixed it for you.