The first "applied mathematics" upgrade comes available before "applied mathematics" becomes available to unlock.
While not explicitly a bug persay; it is a bit confusing to be able to get an upgrade for something you don't have yet.
delicate lotus
The first "applied mathematics" upgrade comes available before "applied mathematics" becomes available to unlock.
While not explicitly a bug persay; it is a bit confusing to be able to get an upgrade for something you don't have yet.
hexed quail
similar thing is in the bee event
fresh sluice
I'm pretty sure this happens in primary simulation too with humanoid colonist