This has been a bug for a very long time. When water is not exposed to the sky, it never freezes and it looks very weird.
Attachments
Comments 6
For feature requests, go here: https://feedback.minecraft.net/hc/en-us
Thank you for your report!
However, this issue is Invalid.
You have posted a feature request or a suggestion. This site is for bug reports only.
For suggestions, please visit Minecraft Suggestions on Reddit or visit the Feedback website.
Quick Links:
π Bug Tracker Guidelines β π¬ Community Support β π§ Mojang Support
π Project Summary β βοΈ Feedback and Suggestions β π Game Wiki
Water isn't supposed to freeze unless it has direct sky access. This is working as intended.