Steps to reproduce:
Create a project
2. Open UI Toolkit Layout Debugger (Window > UI Toolkit > Layout Debugger)
3. In Layout Debugger window press on “Update FrameIndex and PassIndex on underflow/overflow” checkmark
4. Press “Layout Loop++” button
5. Observe the Console window

Actual results: “KeyNotFoundException: The given key '(0, 0)' was not present in the dictionary.
System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) (at <90608de5b7464836a1b66c3d03851b52>:0)” error is thrown in the Console
Expected results: No errors are thrown in the Console

Reproducible with versions: 6000.0.45f1, 6000.1.0b12, 6000.2.0a8
Can’t test with versions: 2021.3.50f1, 2022.3.60f1 (UI Toolkit Layout Debugger window is not available)

Tested on (OS): MacBook Pro Sequoia 15.3.2 (Apple M1 Max)