In existing Terminals, eg Fluent Terminal, Hyper, Terminus, I can copy something from eg a web browser and paste it into the terminal with a right mouse click,

This does not work on Windows Terminal. Instead the contents of a second clipboard are pasted.

Your Windows build number: (Type ver at a Windows Command Prompt)

ver : The term 'ver' is not recognized as the name of a cmdlet, function, script file, or operable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ ver
+ ~~~
+ CategoryInfo          : ObjectNotFound: (ver:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException

I think you mean 😉:

$ [Environment]::OSVersion.VersionString
Microsoft Windows NT 10.0.18890.0

What you're doing and what's happening: (Copy & paste specific commands and their output, or include screen shots)

To replicate

• Copy something from a web page or other app
• Paste using right click

What's wrong / what should be happening instead:

What happens

The contents of a second clipboard are pasted - whatever the most recent selected text pas

What should happen

The content from the web page or desktop app is pasted