We've recently upgraded our server from 20w27a to 20w28a and errors started to appear.
[Server thread/ERROR]: Unknown structure piece id: minecraft:nvi
and
[Server thread/ERROR]: Unknown structure piece id: minecraft:bastionremnant
MC-194434
Unknown structure pieces - nvi and bastionremnant
Resolved
Awaiting Response
1
The server has a datapack, which we believe may be responsible for the issues (the latter of which causes a crash), and so a possible source of the problem may be the "experimental support" for datapacks containing world generation definitions.