On a Modern page using a document web-part I do not have the option to see version history.
However going to the document through the site contents page and default libraries I can see the version history option, I notice that this page stutters a little bit then more actions like version history are added the the context menu
I cannot remember if in the past I have been able to see version history in the document library web part of a modern page or if it is a known limitation of the document library web-part?