iMovie add text to Title fails after latest iPad OS update

When I put text into a Title in iMovie it disappears on playback. This began after I downloaded the latest iPad OS on 12/20/24. Please help me find a way to return to adding titles to an iMovie project.

What I've tried:

Use an established iMovie with Titles as a template. The iMovie would play and display its text, but not edit.

I rebooted the iPad. No effect.

Can I return to the previous iPad OS or is there another fix available?

Thank you.