So apparently pots and garden plots in Nightingale were accidentally being possessed by a thousand angry vengeful plant spirits. That’s the official explanation in the patch notes for why invincible trees were spawning near the items in questions, and it’s not like the developers would fib in the patch notes. So you can instead take heart that the spirits in question have been exorcised and players can now successfully continue gardening with significantly fewer cursed invulnerable trees. Don’t say the patch never did nothin’ for ya.
The patch is generally focused on fixing small issues across the game like that, like fixing an issue that would lead Sheliak’s Yoke to lose aggro and become unresponsive as well as having Nellie no longer requite questions from players to progress her dialogue. Check out the full patch notes for all the changes for both online and offline players; it’s no big content addition, but it should make the game a bit smoother for everyone.
The patch is a followup for the Realms Rebuilt update, which MOP’s Chris toured and found to be a solid revamp.