An active Spawner will display flame like particles. These do not render when viewed through a glass pane.
In the screenshot attached it is clearly visible that the effect does not render through the glass pane on the left, while they are visible on the side where there's no glass.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-161917, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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