The fact that you're counting shows just how deeply this pattern of being overlooked has worn on you - that's 47 times your effort has been made invisible, and that pain is completely valid. It sounds like you've been hoping things would change on their own, but after nearly four dozen instances, this manager has shown you exactly who they are. Maybe it's time to start documenting your work more formally or having those conversations higher up the chain, because your contributions deserve to be seen and acknowledged.