Issue description
It is currently possible to compete the research "fermentation" without completing research "corn farming" despite corn farming being shown as required for fermentation.
Expected behavior
Fermentation research to be unavailable until corn farming is completed or queued.
Reproduction steps
Unlock research lab III and start fermentation research before doing anything with corn farming research. It may require finding corn seeds on the world map.
Game version
v0.4.12e
Attachments
