Breaks on Copy and Paste

[powercore2000]

When I pasted a prewritten markdown passage I was working on in my text editor, and tried to copy that passage again, the tab becomes unresponsive, and breaks. I lost all of the work because the page was unrecoverable. It happens when passing the readme attached below

README.md

[tanabe]

@powercore2000

Thank you for your feedback.

I lost all of the work because the page was unrecoverable.

That was so sad.
I recently added a feature to the site that saves the last content locally.

It happens when passing the readme attached below

It looks like attached file has not contain any tab characters.