I haven't played Minecraft in a while and started it up today. I was surprised to find that none of my mob grinders were working. As far as I can tell neither skeletons nor zombies climb in water elevators (Alternating water source block and air block (sign)
Comments 2
Thank you for your report!
However, this issue has been closed as Working as Intended.
Remember not all differences between game versions/platforms of Minecraft are bugs. As mentioned you might be able to adjust your design by using the new bubble column behaviours. If you need help or have a suggestion you might like to follow a link below.
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📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
After the 1.13 update, mobs no longer float upwards. You need to put all source blocks with soul sand to make a bubble column to make them float up.