Page tree is not synchronized with Bookmark
There is a regression in TYPO3 v9 (and that's the reason why I think it's not exactly the same as #83125 which I mark in relation anyway):
Up to TYPO3 v8, when you created a bookmark to some deep page and went to it, the page tree would expand and show the corresponding page you are landing to:
after clicking, the page tree reflects the current page:
after clicking, you are naturally editing the correct page but the page tree is behaving like it's dead and does not show any sign of life, it is exactly the same as before:
Updated by Tymoteusz Motylewski 2 months ago
there is an JS API for selecting page tree nodes.