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The underlying issue is that the "Pane" is used both as a model and as
a UI element and so a pane loses its content as soon as it is closed,
but the tree only gets reordered after the animation has finished.
This PR is truly just a hotfix, because it doesn't solve this issue,
it only adds checks to the function that crashes.
Closes #17869
Closes #17871
Validation Steps Performed
Split pane
a few times