When you upload a world with a behavior pack it simply won't upload it to the realm.
I have searched for this issue and I have seen that others are having the issue; however, the issue says "Resolved" and it is simply not resolved. It is still a bug and it is still occurring. I have had this bug for over a year now and it is not a all resolved and I don't believe it has really been looked at.
Linked issues
Comments 2
Thank you for your report!
We're tracking this issue as REALMS-2108 so I've requested this report be resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
Please don't forget to use the search feature before submitting a bug to see if it has already been reported. The less time we spend linking duplicates means more time testing and confirming the bugs.
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What's the ticket ID for the mentioned ticket?