Oh wait.
Maybe this was the source of why people sometimes don't get paired in Friend by Friend and they recently fixed it. Hopefully it's better now.
FBF utilizes serialization and deserialization on the code every time people are attempted to be matched.

https://feedback.vrchat.com/vrchat-udon-closed-alpha-bugs/p/1171-deserialization-fires-for-owner-and-serialized-data-is-overridden-by-old-da