Not sure if this is a bug, have been playing several turns (20-30) after cancelling Aristocracy and shifting towards Republic in Political entitlement.
Also cancelled other Aristocracy-dependent civics (oligarchy). I would expect Republic evolution to be unlocked and appear after shifting towards its direction but this did not happen.
All the requirements are met (empire pop is above 50, republic is selected in political entitlement, centralized power, passed industrial era, already in contemporary).
Your diagnostics logs. These are time stamped, and any time you close and relaunch the game, new ones are started. Please grab all diagnostics logs related to the session you were playing where the issue occurred. These are by default located:
Lexpresso
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