Steps to replicate this bug.
1. Place down a nether portal block.
2. Place glass in front of the nether portal block.
3. Observe through the glass.
Additional Notes: Particles emitted from the portal are still visible through the glass.
Linked issues
duplicates 1
Attachments
Comments 2
Thank you for your report!
However, this issue is a {color:#FF5722}Duplicate{color} of MCPE-32450.
If you have additional information, please add it to that report.
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Seems to work now, after closing the world and opening it again.