Bug - Cursor doesn't blink.

When I Paste a text with specific formatting, the cursor marker doesn’t blink and sometimes completely disappears when placed inside a word.

I’ve attached a sample project to illustrate the problem.

Does the issue persist after switching to another document and back? I’m not reproducing anything like what you describe in the downloaded copy, so it seems it may be more transient or related to program or system settings than project-specific.