Copy-pasting content gives weird experience

[shuo-s-feng]

Describe the bug
When copying and pasting the content inside the editor, the copied content looks weird. Take a look at the following screen recording.

Screen.Recording.2025-04-25.at.9.56.52.PM.mov

To Reproduce
Just to open the official basic example at https://stackblitz.com/github/TypeCellOS/BlockNote/tree/main/examples/01-basic/01-minimal?file=App.tsx, and you will be able to reproduce.

Misc

• Node version: Online demo that I don't know the node version
• Package manager: NPM
• Browser: Chrome with Version 135.0.7049.96 (Official Build) (arm64)
• I'm a sponsor and would appreciate if you could look into this sooner than later 💖

[screenspaceio]

I am experiencing this same issue - paste will nest the pasted content and add additional empty bocks. For me, this happens when copying content directly from a BlockNote instance and pasting. Copying HTML or content outside of BlockNote and pasting it works fine.

And possibly related, this exact same issue happens when using drag/drop to reorder blocks. When dragging a block up or down, the dragged block will become nested and a new empty block above the pasted block.

[Paarth-K]

The same thing happens when you try and parse the blocks from HTML, using editor.tryParseHTMLToBlocks. Everything seems to get indented. #1651 is a similar bug to this