Seed: 5450957878814971038
How to reproduce?
1 Install 21w42a
2. Open Minecraft
3. Create a New World
4. Enable Cheats
5. Teleport to this coordinates -> /tp @p -11341.723 72.54862 3216.804

The biome was bamboo_jungle, very bizarre occurred in my world seed. An Azalea tree spawned on top of a bamboo stick. No further explanation, but the developers can fix it to the best of their abilities.