Ah... from your initial message, it sounded like KoL itself blocked you from using it - the message about not allowing the Bs near your back. For BHY runs, it should definitely follow the beeosity rules. If you choose to allow 3 beeosity, it should get to pick between CoT, BB, or any other source for those Bs. Unless KoL is actually blocking you from using it ever, in which case marking them as allowed would be a bug.
So... what's the bug? Options:
1) KoL blocks you from using Buddy Bjorn, even if you're willing to be stung, but mafia suggests it in the maximizer and believes it's available as an equipment item - the BB should be marked as restricted (or something similar) in Beecore so that it isn't suggested or used.
2) KoL blocks you from using familiars with Bs in the Buddy Bjorn, allows you to use the Buddy Bjorn itself, and mafia suggests slotting B familiars into the BB - the BB is okay, but the B familiars which are already restricted need to also be restricted for the BB and probably for the CoT.
3) KoL does not block you from using familiars with Bs in the Buddy Bjorn, but mafia doesn't count the Bs for the familiar towards Beeosity, despite them causing damage - the Bs for slotted familiars need to be counted as well.
4) KoL does not block you from using familiars with Bs in the Buddy Bjorn, mafia agrees with KoL for Beeosity, and your maximizer string didn't set your desired Beeosity - not a bug.