I have noticed that MobGriefing has been turned off (Most Likely because of creepers) on skyblock, as a result villagers cannot breed/farm/pick up bread, carrots, potatoes, wheat, seeds, beetroot and beetroot seeds. I suggest you once again enable MobGriefing and write a simple plugin to set the explosion power of creepers to 0. Therefore disabling them from causing any damage. I hope this suggestion gets accepted and villagers can once again breed and farm. Thank you. ~NotStanley_/Mesothelioma_
Agreed c: In the meantime, you can increase the likelihood of your villagers breeding by trading with them if you are unable to get them to share food with one another