Textiles can be research at age 2
but Textiles (improved) can be research at age 3
siha bow limbs can be research at age 3
but siha bow limbs (improved) can be research at age 4
They shoud be a bug.
Thank you for reporting @ansontai! This one is actually by design. However, I will capture your feedback that they should be available in the same age. Thanks!
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