How to reproduce:
1. Open the attached “MinWidth.zip” project
2. Enter “SampleScene” Scene
3. In the Hierarchy window, expand “Canvas” and “Dropdown” GameObjects
4. Select “Image” GameObject
5. In the Inspector window in the “Min Width” text field of the “Layout Element” Component, insert “NaN” text
6. Observe the result

Expected result: The text field doesn’t disappear
Actual result: The text field disappears

Reproducible with: 2021.3.31f1, 2022.3.10f1, 2023.1.16f1, 2023.2.0b12, 2023.3.0a8

Reproduced on: macOS 13.5.2 (Intel)
Not reproducible on: No other environment tested

Note: The user was not able to enable the “Min Width” checkbox until going to Debug Mode and removing “NaN”