deeplinking tools show empty gray screen and can't find flutter project

<-- Please describe your problem here. Be sure to include repro steps. -->

first of all if I click on validate deep link where it shows me the current project

it shows me that it's not a flutter project

then if I type the URL in the 2nd input by myself and click validate deep links I get me an empty gray screen

DevTools version: 2.42.3
IDE: VSCode

The first issue (dialog says it is not a Flutter project) should be fixed by #9571

I'm marking the second issue (grey screen) as a duplicate of #8873

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