OnSubmit event is triggered indefinitely on UGUI Input Field after dismissing keyboard on mobile

Steps to reproduce:

1. Open attached project (ugui-inputfield-test.zip)
2. Switch to iOS or Android platform
3. Build and run the project on device
4. Tap on “UGUI” input field
5. Enter some text
6. Tap outside of keyboard or tap on “Done” button to dismiss keyboard & trigger OnSubmit event
7. Check console output

Actual results: “OnSubmit called: 1” is spammed in console and text field value keeps changing constantly, indicating continuous OnSubmit calls.

Expected results: “OnSubmit called: 1" is logged in console once, text field changes value once.

Reproducible with versions: 6000.3.0a4, 6000.3.0b6, 6000.5.0a4

Not reproducible with versions: 6000.0.50f1, 6000.3.0a3

Tested on (OS): 

• iPhone 16 Pro, iOS 18.6 - Reproducible
• iPad Air 4, iOS 26.1 - Reproducible
• Google Pixel, Android 13 - Reproducible
• macOS standalone - NOT reproducible
• Web - NOT reproducible

Notes:

• Tested with TouchScreenKeyboard and external BT keyboard on iOS - reproducible with both.
• Does not reproduce with TMP input field and OnEndEdit event.