Greetings from the syncfusion support,
We couldn’t see the problem faced by you ”Wrap is not working on underscore text” while enabled the AllowTextWrap api. We have created a sample with your requirement. Please refer the below sample for more information.
Still you are facing same problem in your end. Please share the below details to us it will be help validate further.
- Share full grid rendering code example
- Share the Video demonstrate of the issue.
- Share Syncfusion DLL version.