Vaadin 21: "Assertion error: No child node found with id -1" when opening a link in new browser tab

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In a Vaadin 21.0.1 application there are some Tabs with a RouterLink in each Tab for application navigation.

In general this works fine. But when I right-click at one of these Tabs / RouterLinks then a new (empty) browser tab opens and this error occurs: Assertion error: No child node found with id -1.

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In Vaadin 20.0.9 the new tab also stays empty.

Has anybody an idea how to handle / fix this?

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