On the second screen, the icons-only task manager shows also applications of first screen, despite "Show only task from the current screen" option is enabled. I noticed that the other kind of task manager (the one which is NOT icons-only) works well instead, showing only the applications opened on the second screen - Plasma 6.0.2 - Qt 6.6.2 - Fedora 40 KDE
Should be fixed in 6.0.3. Feel free to reopen if the problem persists. *** This bug has been marked as a duplicate of bug 482339 ***