There was a livestream about 2 weeks ago when they explained that they had fixed the UK and the rest is scheduled for SimUpdate 2, but the status field isn’t long enough to hold this information. So maybe fixed in a few months? I’m holding my breath.
Until then (and maybe even after this) the Seasons 2024 addon (Seasons 2024 Enhanced - By Bijan - Released) might be your choice as it is said to solve the tree issue globally to some extent, besides drastically improving vegetation in specific cities and areas (like the Canary Islands).
Asobo should have hired this guy years ago, then we would have a much more natural scenery in vanilla FS2024.
Disclaimer: I haven’t installed and tested this addon myself yet because I’m waiting for the marketplace to open but there are other ways to purchase it already now.