JOIN IN PROGRESS - CUSTOM GAMES

So a lot of people are wondering whether or not join-in-progress is going to be available for custom games in H5. Can 343, or anyone shed light on this question. Thank you.

Its’ already been confirmed Join-in prog in custom games and warzone, not arena though

It’s a custom game, where is the logic in them NOT allowing JIP? I mean, even if it were not already confirmed, why wouldn’t they allow it?

Is there a link confirming that? If so. can you post it? Thank you

https://www.halowaypoint.com/en-us/community/blog-posts/enter-the-arena

In the “Every Arena match starts from the beginning” paragraph.

Confirmed jip in warzone and customs