Clipboard manager shows - as content copied from Microsoft Excel

Describe the bug
When copying text from Excel cells and bringing up the clipboard viewer, this content is displayed as - (dash). If using Cmd-v to paste it, it pastes correctly. But if using any BTT defined clipboard processors before pasting, it gets pasted as -

Device information:

  • Type of Mac: MacBook Pro (13-inch, 2020, Four Thunderbolt 3 ports)
  • macOS version: 12.6
  • BetterTouchTool version: 3.870