Burned-in timecode only displays when playing or scrubbing in sequence and won't export Premiere Pro

Hi,

I have a number of sequnces, each a rushes roll. I want to export to a small H.264 file with burned-in timecode. I have added the Metadata and Timecode burn-in Effect (I only need timecode) and it works fine prividing the sequence is playing or is scrubbed through. But when the sequence is paused, it disappears. If I export it also doesn't feature on the exported file, even after rendering.. I have used this feature many times in the past but doesn't seem to work now with Premiere Pro 2024   24.1.0

Any ideas?

Thanks,

Steve