Modpack version
1.65d

Can the issue be reproduced?
Yes

Logs
No logs.

Issue
Crafting the Amber Block from Thaumcraft can be done by either TC's amber, or BoP's amber, however, when you craft it, the return recipe actually gives you 9 of the BoP amber, even though it only costs 4 to craft, allowing you to infinitely craft duplicate it for free.

Update.