All panels made from splittable Child components (type=CHILD, using splitter) add an extraneous horizontal scrollbar on the bottom - this is likely due to some change in the latest version of Windows 11 Insider. Of note, the scrollbar *does* offset by a small margin, which suggests that the content within the scrollbar container is being made a little bigger than it should be, even if it's just empty space.
Numbered Steps to Reproduce Problem:
Cleared cache and reinstalled BYOND, including old versions (i.e, this is not a new BYOND problem, but rather a new OS issue) - made a testing project to find out if it was present beyond SS13, and found it happening in both the default BYOND interface as well as a simple homebrew test interface.
Expected Results:
Previous behaviour.
Actual Results:
Horizontal scrollbars blocking UI elements and being weird.

Problem occurs:
Every time.
In all games.
On all accounts.
But *not* my Win10-based machines.
When does the problem NOT occur?
An extremely barebones interface made without using the child element shows no extraneous scrollbars.
Did the problem NOT occur in any earlier versions? If so, what was the last version that worked? The problem STILL OCCURS using old versions.
Workarounds:
None yet found.