Since the 1.16 Nether update went live bubble columns no longer work in flowing water. For example, in my Minecraft Realm we had several 1x1 columns for mob farms and for elevators from bedrock to the surface that stopped functioning after the update. Source blocks that are uninterrupted from the Soul Sand will produce bubble columns but any flowing water above the Soul Sand cuts off the bubbles.
Here's a Reddit thread related to the topic where other users are experiencing the same:
https://www.reddit.com/r/Minecraft/comments/hesetu/bubble_column_mechanics_changed_in_116/
Comments 2
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Thank you for your report!
This project is for the Bedrock Dedicated Server software only. Please head over to the correct project (links below) and create a new report for your bug. Please don't forget to search for an existing report matching yours in the appropriate project before raising a new one.
To ensure your report has all the information we need, please have a read through Guide: Writing Helpful Bug Reports for Minecraft and remember to include steps to reproduce the problem.
– Minecraft: Bedrock Edition — Gear VR, iOS, Android, Windows 10 (from the Windows store), Xbox One, Windows 10 Mobile, Fire TV, Nintendo Switch, and PS4
– Minecraft: Java Edition — Windows, Mac, and Linux
– Minecraft Launcher — Bugs about the Minecraft Launcher specifically
– Minecraft Earth — AR Compatible Devices
– Minecraft Dungeons — Action-adventure title set in the Minecraft universe
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 BDS Wiki – 📖 FAQs