Ideas
I want to also issue a report of the same bug. It happens sometimes when I right click to aim down sights, and that's the only context in which I've seen it happen. I right click to aim and the scoreboard pops up in "full view" mode that allows you to scroll through players and select them. Though I can exit the "full view" mode I cannot exit the scoreboard. Pressing tab to close it does not work, clicking the "exit scoreboard" button does not work.
The scoreboard goes away if the player fully dies and has to respawn, but I have noticed that once the bug is triggered, the likelihood of reoccurring by right-clicking to aim down sights increases dramatically. I have to quit the game and hope it doesn't pop up again for a while.
The bug has started occurring since the winter update.
I am on Windows 11 25H2, AM4 X570, 5800X3D, AMD 7900 GRE 25.11.1