If you are in survival and you hold left click to place scaffolding then at the top when you have no more scaffolding it will have place ghost scaffolding that you can climb but if you break it won't drop anything
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-148795, 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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Behavior can be reproduced in 1.15 Pre-Release 2 by repeatedly toggling between breaking and building the scaffolding, no matter it being in survival mode or creative.