Minecolonies version

Version: 1.12.2-0.10.206-ALPHA

Expected behavior

Stonemason is the most appropriate crafter to make flower pots.

Actual behaviour

 Cannot teach the flower pot recipe to the stonemason. 

Steps to reproduce the problem

1. Open Stonemason GUI
2. Click on Teach Recipes
3. Add in clay bricks in 'v' pattern to make a flower pot
4. Error given states that: Unable to store the blueprint. Either the Stonemason has no space for any more blueprints, or the blueprint doesn't correspond with its profession.