TMP input field truncates string unexpectedly

Reproduce steps:
1. Add a tmp input field and set line type as multiline new line
2. Add a content size fitter with preferred size selected
3. Create a simple script to set the text and lineLimit, for example:
TMPInputField.lineLimit = 3;
TMPInputField.text = randomString;
4. Enter playmode

Actual result: the text string is truncated based on the lineLimit value
Expected result: text string shouldn't be truncated.

forum thread -https://forum.unity.com/threads/textmesh-pro-ugui-hidden-characters.505493/#post-7045780