bug: rerender causes leak for shot cubes

https://github.com/pmndrs/ecctrl/blob/main/example/ShotCube.tsx

https://github.com/user-attachments/assets/63b9d359-a042-460f-91c5-eb8e32f00bb6



1. open example project
2. left mouse click to shoot cube
3. save shotcube.tsx to cause hmr
4. left mouse click to shoot again
5. 2 cubes spawn instead of one
6. save again
7. shoot again
8. 3 cubes spawn etc