[Z7 Beta] Annotation pane and toolbar turn blank after trying to change page number

Hi all,
in the most recent beta (7.0.0-beta.83), I've noticed the following problem:

1.Open a pdf with no previous annotations.
2.Highlight a sentence with the annotation tool.
3.Open the annotation's menu (three dots) in the annotation pane, click on "edit page number"

Result: The whole annotation pane and the toolbar at the top of the reader turn white.After closing and re-opening the tab, everything is back to normal.

I've not been able to reproduce this, but it has happened twice today, for two different PDFs.Both of them were somewhat larger OCRed files (~14 mb for the bigger one).
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