Les vignes ne peuvent pas être placées au plafond si elles sont collées ensemble sous des escaliers ou dales.
Aprés un certains temps ( random tick speed=2000 ),ils disparaissent.
The vines cannot be placed on the ceiling if they are stuck together ONLY under "non-solid blocks" : stairs, slabs..
After a certain time (random tick speed = 2000), they disappear.
Thank you for your report!
However, this issue is Invalid.
Your game, launcher and/or server is modified.
If you can reproduce the issue in a vanilla environment, please create a new ticket.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang Studios or the Bugtracker.
Any plugin or resource pack issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run extensively modified server software.
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