Just as the summary states, candle flames are not visible through stained glass panes - possibly stained glass as well (I did not check).
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Arisa Bot
Thank you for your report!
We're tracking this issue as MC-188529, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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Duplicates MC-188529 Set Options > Video Settings > Graphics to Fabulous!