https://wccftech.com/animal-crossing-star-tree-hack-removed-update-1-4-1/

Nintendo has removed the Animal Crossing Star Tree hack from the game through a freshly-released update, Animal Crossing New Horizons Patch 1.4.1.

Hacked trees have been around for quite some time now in New Horizons, but the new report player option introduced when exploring Dream Islands following last week’s 1.4.0 update, has likely resulted in Nintendo removing the Star Tree Fragment trees from the game altogether. Apparently, Nintendo began taking down Dream Islands from players with Star Trees following reports from other New Horizons players. Some players are said to have received violation e-mails from Nintendo due to cheating.