Minecraft Username: t_bone199205

Brief Description: Everytime I find a set of peaceful mods in the mining world, I never
have time to breed them because in less than 5 minutes the mobs just
disappear. This has happened to me 3 times so far and it's getting
really irritating.

Instructions: Find some random mobs. Wait for them to disappear.

How many times did you recreate this bug?: At least 3 times

Result: They are gone.

Expected Result: They should still be alive.

Evidence: You can't capture this kind of evidence in picture form.