Modpack version
1.81a

Issue
you get the "botania flower" wich you can only get through bugs, description of flower as follows "If you have this, it means something went wrong, you should report it", you get it by using the unbreakable wand from better builders wands on a generating flower (i got it from the Endoflame)

Logs
Input pastebin link to crash-report or latest log, if applicable

Thank you for the report, I will investigate the issue.

Endoflame has NBTs, but there is a bug in the unbreakable wand that erases the NBTs of the TileEntity blocks to be installed. Thus, this is a bug in BetterBuildersWands.

portablejim/BetterBuildersWands#59

I do not believe I can fix this, and the majority of modders no longer support 1.12, so I'll close this issue.

Nethertheless, thank you for reporting :)