I first noticed this a while back. But it has yet to resolve itself.
When I click on the post feedback link in the 10k tools, it hangs for a while.
Then it gives me an error message:
The way this is architected absolutely does not scale. It's also not something we want to put resources into fixing given opportunity cost and what it would take to refactor.
We will be removing the link in the next build and removing the page and code later in the week. I'm sorry that answer sucks, but it's just not an important feature to us, and it would take a significant time investment to fix.
This link still finely works anywhere, except Stack Overflow.
So, whatever reasons were to disable it, the page is still accessible there on any Stack site (works on beta site for me; confirmed to work on Meta; for me on other sites excluding SO (which gives "not found") and LH (which fully works, because I have required rep there) the page says "more privileges required").