All transparent blocks are experiencing some kind of z-fighting or visual glitch. It changes in intensity upon movement of the camera, attached are examples.
Related issues
Attachments
Comments

Thank you for your report!
We're tracking this issue in MC-219985, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as invalid, which means this is a technical support issue. Please take a look at the parent ticket (MC-219985) and see if a solution is provided there.
If you need additional help to fix this problem, please contact Community Support and refer to this ticket (e.g. "I have reported this issue on Mojira as MC-XYZ.").
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki