when I create such a button
Image: https://www.dropbox.com/scl/fi/6yc2uvzwtpr2qmtw2cck8/Clipboard-1.jpg?rlkey=t94uip4vziefz0mzk1h6692m4&st=iydt332s&dl=0,
copy this link https://www.youtube.com/watch?v=5a4Q8eIqMdU (for example) to the clipboard, and use the button,
i get this
Image: https://www.dropbox.com/scl/fi/r3diev20fehq8whkkug1d/Clipboard-2.jpg?rlkey=yyexewba0zx4rmeg5xsbcoawr&st=uluvjyxn&dl=0.
Same way it works with %$CLIPBOARD% and other new virtual variables.
It seems that TCb5 inserts text between %$ and % instead of clipboard content.
The same result I get without the question mark, but it is slightly harder catchable
