I placed another Glass Pane/Iron Bars over them and outline is visible.
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Please don't update your issue anymore, it's been in all versions since 14w10b (for over three years now) and won't be fixed.
Thank you for your report!
However, this issue is a Duplicate of MC-50349 and will be closed accordingly.
It will be linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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