UITK Debugger TextElement element’s font-size property field deselects when inputting a number

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Open the UI Toolkit Debugger (Window > UI Toolkit > Debugger)
3. Select any Panel that has TextElement elements
4. Search for "TextElement" in the UI Toolkit Debugger window
5. Select a TextElement element from the found results
6. Enter a number in the font-size property field
7. Observe the UI Toolkit Debugger

Actual results: The font-size property field is instantly deselected after entering one number

Expected results: The font-size property is still selected and editable

Reproducible with versions: 6000.0.65f1, 6000.3.4f1, 6000.4.0b4, 6000.5.0a4 

Not reproducible with versions: 6000.5.0a5

Tested on (OS): MacOS Silicon Tahoe 26.1, Ubuntu 24.04

Notes:

• Other similar property fields do not deselected after inputting just one number