Black bar on ui_date_picker dialog?

Does anyone know why there is a black bar near the top of the ui_date_picker when I select a date? I've searched the forum and google but can't find anything related to this.

I just noticed it today so I can't be certain if this is new or it's always been like this.
node-red-dashboard 2.29.0
node-red v1.3.3
Thanks for your help

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