Initial Questions

• I have searched this issue tracker and there is nothing similar already, and this is not on the list of known issues. Posting on a closed issue saying the bug still exists will prompt us to investigate and reopen it once we confirm your report.
• I have verified that this issue occurs in a SUPPORTED environment, meaning I can reproduce this WITHOUT OptiFine, and without Bukkit+Forge server software like KCauldron, Thermos, Crucible, Mohist etc

etfuturum-2.6.2

So is spawn of bees based on the Bees nest block? I looked for it on JAS cfg file and found that they (as creature) wont spawn in any biomes. And if I replace them with growcraft ones (via the blockreplace MOD), would bees still spawn? I mean, if it is possible to spawn before nests are replaced, and then bees spawn so that they looks like spawning on GC nests? If not, would u condiser supporting custom bees nest block?

Please stop using issues for discussion and questions. Issues are for issues. If you keep doing this, I'm going to block you from posting here. There are places to ask those questions.