Next thing you know, someone's going to rediscover commedia dell'arte!

edit for substance:

Plots of Commedia dell'arte scenarios, well known in England at the time Shakespeare was alive and writing, bear close similarities to the broad strokes of the plots of many of his plays. ( https://thought.artsci.wustl.edu/podcasts/commedia-dellarte )

This doesn't really connote plagiarism.