Gridbox / media manager bug boutons not work

hello,
I just installed the latest gridbox and I have a bug:
When I am on a simple gridbox page and I want to insert an image (or change an image) the media manager popup opens but the 'page 2' and 'next' buttons do not work on the root (in the folders it seems to work well)
see attachment
please tell me how I can fix it

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