Right-click copy in WYSIWYG does not work. "CTRL-C" does work, but for those using a mouse this is quite inconvenient. It does work, though, in a MD code mode.
Also, right-click "cut" cuts the text, but the clipboard is still empty.
Joplin 1.4.18 (prod, win32)
Sync Version: 2
Profile Version: 34
Keychain Supported: Yes
Revision: 76c4d99b8 (master)