Nintendo has been busy patching Animal Crossing: New Horizons these past few months.
The flood gates opened when a large number of community members made use of a get-rich-quick duplicate exploit far ahead of a patch that removed it; and Nintendo continues to battle hackers every few weeks.
Fresh off of a patch that introduced a limited form of save backups to the game, as well as efforts to combat hacked dream worlds, Nintendo is stamping out another hack: special trees. As a recap, folks have been using hacked trees as a way to grow and showcase rare items like Star Fragments: now, they'll be reverted to money trees post-update. This has been a long time coming as tree hacks have been rampant.
Patch 1.4.1 squashes that, as well as a bug that eliminates shiny soil after using the dream mechanic and an issue that involved hitting rocks with a shovel in a specific way.
Version 1.4.1 [Nintendo]