Thank you for contacting Syncfusion support
We have checked your reported issue and we would like to let you know that it is a known issue and we have already fixed and included in our version (126.96.36.199-beta). So, we would suggest you update the latest Nuget packages and use the updated script file to resolve this issue in your end. Please find the links below.
JS file Links:
<link rel='nofollow' href="https://cdn.syncfusion.com/ej2/17.3.26/material.css" rel="stylesheet" />
Please find the below code snippet for your reference,
<EjsTextBox Multiline=true Placeholder="Enter your address" Value=@Val></EjsTextBox>
public string Val = "Mr. Dodsworth Dodsworth, System Analyst, Studio 103";
For your convenience, we have prepared a sample. Please find the sample link:
Could you please check the above sample and get back to us, if you need any further assistance on this?