Audio waveform in the timeline dissapears when zoomning in beyond the frame.

I can no longer zoom in beyond the frame when editing audio on the timeline set to show audio time units.  The waveforms disappear, making it unusable to fine-tune dialogue cuts. It seems like Premiere is not creating peak files for when the audio is zoomed in or is not retrieving them.  

The waveforms started disappearing with the last beta version 24.5 build 29.
Please fix this issue.