At rose garden, golden bees are usually unkillable. If you accidentally hit one, you will always miss. With one exception. Marksman's Snipe skill can kill them. It seems like bees have ~200k HP. Snipe deals between 190-200k damage, leaving a bee barely alive. It's not really an issue because I never accidentally hit bees with snipe twice in a row, but I felt like showing it anyway. Snipe pretty much ignores everything. After an update (forgot which), it ignores weapon cancel as well. I assume this was an oversight of that.
Pallys Heavens Hammer will also dmg them and leave them with the same HP. It is nice though since they can be far away and just fly towards for ez catch
I think tried sniping it twice before. It either has more hp than the HP bar suggests or it can't be killed. I guess someone could try just sitting their and seeing how many snipes it may take I think snipe just takes -200k hp regardless of what the actual display shows. You could kill GPQ Golems this way: