System.ArgumentOutOfRangeException: startIndex cannot be larger than length of string.

Sentry Issue: [UNITY-EXPLORER-PJR](https://decentraland.sentry.io/issues/7642799339/)

```
System.ArgumentOutOfRangeException: startIndex cannot be larger than length of string.
Parameter name: startIndex
File "mscorlib__1.cpp", line 32983, in Substring
File "UnityEngine.TextCoreTextEngineModule.cpp", line 5536, in DeleteSelection
File "UnityEngine.TextCoreTextEngineModule.cpp", line 5568, in ReplaceSelection
File "UnityEngine.TextCoreTextEngineModule.cpp", line 5693, in Insert
File "UnityEngine.UIElementsModule__2.cpp", line 32362, in OnKeyDown
...
(22 additional frame(s) were not displayed)
```
This issue was automatically created by Sentry via [Explorer Alpha Github Issue Creation](https://sentry.io/organizations/decentraland/monitors/alerts/3130340/)

Start with the linked Sentry issue and its stack trace, then inspect the Unity UI Toolkit input path around OnKeyDown, Insert, ReplaceSelection, and DeleteSelection. Reproduce the reported text-editing failure if possible and confirm that the ArgumentOutOfRangeException no longer occurs; the issue does not name a project file or test.

Written by the indexing model from the issue text.