**Describe the bug** <what's going wrong!?> Can't change the position of the custom block using the drag handle button. **To Reproduce** https://www.blocknotejs.org/docs/custom-schemas/custom-blocks#:~:text=Custom%20Blocks-,Custom%20Block%20Types,-In%20addition%20to open the link, under Custom Block Types, inside the demo box there is a custom block that is not draggable, I have this problem on my project too.