Here, a regular text widget shows the content of the TextField, swapping spaces with bullet points for clarity.
The issue occurs when moving the cursor around with the mouse, and then adding spaces. Text input works normally, but the cursor seemingly gets stuck when moved back at the end of the first line

Issue

Tested on stable & dev channels, both on Chrome & Safari

Code used for the demo
https://github.com/BertrandBev/text_field_issue