Whenever you break the block below nether shoots, the shoots remain intact and floating above an air block. If you try to update them, it has no affect. You can even place blocks other than nylium under them, and they will not be damaged.
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Thank you for your report!
We're actually already tracking this issue in MC-170844, 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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