Since upgrading to Premiere 25.X, I have a UI glitch with Stacked Panel Groups.
If I have the a panel in a stacked group, the panel itself overflows the group. This means that I have to scroll down within the panel to access the UI elements and buttons at the bottom, like the List/Icon View, Create new Bin, etc. of the Project/Bin panel.
If I have a long enough list of items in the bin, I cannot click and drag a media item into the "Create New" button to make a new sequence from the item because the UI won't scroll down while dragging.
In addition, scrolling with the mouse wheel while hovering over the panel stops partway sometimes, forcing me to click and drag the scroll wheel.
This happens with all panels, not just the Project panel, but it's the most inconvenient one.
stacked group with cut-off interface
If I use non-stacked panel groups, the panel resizes itself to fit the size of the group properly and the scroll bar is only for the items within the panel:
non-stacked group with correct size behavior
EDIT: here's a larger screenshot for more context, showing both a stacked and non-stacked panel group:

I'm on 25.1.0 (Build 73) on Windows 11.