When breeding Bees (with flowers) they give you the advancement "The Parrots and the Bats".
However, they also don't apply for the challenge advancement "Two by Two", which for the moment haven't been implemented yet.
MC-159389
Bees don't apply for the challenge advancement "Two by Two"
Resolved
Duplicate
0
Thank you for your report!
We're actually already tracking this issue in MC-159357, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.