Back in 15.2 I could erect a fence on top of a cobblestone wall and the vertical ends of the fence would force the wall to meet them (connected.png). At some point this behaviour changed to what is shown in flat.png.
Is this intentional or a real bug? FWIW I prefer the old behaviour.
Thank you for your report!
We're actually already tracking this issue in MC-172092, so I've 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 to see if the issue has already been mentioned.
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