Shift-Command-5 leaves a Frozen Box on screen
Shift-Command-5 FROZEN BOX - Apple Community
I tried this solution and doesn't seem to work.
Quite easy to reproduce this issue macOS Monterey 12.4 (21F79).
Just press CMD+Shift+5 and adjust the box-area you want to capture, press enter key.
Now screen will be captured, and the box area will be left lit, and the other area dimmed on screen.
MacBook Pro 14″, macOS 12.4