autoupdate interferes with SignChestShop

[ncf1]

Describe your environment

• MassiveBooks version: 2.12.0
• MassiveCore version: 2.12.0
• Spigot version: 1.12
• Config pastebin: Default

Steps to reproduce this bug

1. _____Create book, autoupdate enabled
2. _____Place into SignChestShop shop interface
3. _____Price book

Observed results

Book autoupdates to remove appended price upon closing shop interface

Expected results

Book should retain price so that it can be purchased.

I have been trying to get server books to be given to players on join, ( https://www.spigotmc.org/threads/massivebooks.35756/page-4#post-2510485 )without success, so i have since tried to overcome this inability by adding books to shops with no cost. However, with book autoupdate enabled, it seems that the method SCS uses to apply a price, the price will get reverted by book autoupdate. As a result, i have to disable auto update for server books. If it were possible for the server to issue the serverbooks to players i could avoid this issue, but it technically would still exist for anyone trying to set up a SCS shop featuring books with auto update enabled. its plausible that any plugins which modify books in a similar fashion will also be incompatible.