SUMMARY
I can reproduce on kde-neon-unstable-2024-05-28 and on two instances of Fedora 40 on different computers. The KDE Neon had VLC preinstalled via it's repo, and the Fedora installations have VLC from flathub. Dragging on the bottom part of VLC player causes the cursor to 'jump' to the top left part of the window. This might affect other programs too, haven't found one yet though. Please check the attached video, where I demonstrate this strange behaviour.

STEPS TO REPRODUCE
1. Click and drag at the bottom part of VLC player, anywhere on the empty space between the play/pause/stop etc. controls and volume bar on the right.

2. The cursor immediately jumps to the top left part of the window. The 'drag' state is still respected so the window starts moving. This happens regardless of the window being maximized or windowed.

OBSERVED RESULT
Cursor jumps/teleports to top left/middle left edge of window

EXPECTED RESULT
Maybe that part is intentionally drag-able to move the window, but the cursor shouldn't jump to a different location

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 40
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.1
Kernel Version: 6.8.10-300.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-6300U CPU @ 2.40GHz
Memory: 11.1 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 520
Manufacturer: HP
Product Name: HP ProBook 640 G2

ADDITIONAL INFORMATION
The white theme video is from neon livecd, no idea why most of the icons were missing.