If you are looking at an answer with a code snippet in it, and the answerer updates the answer, you see
An edit has been made (etc.). If you click that, the answer is refreshed, but the code snippet buttons (Run, Copy, and Expand) go missing.
The code snippet buttons are there again after reloading the entire page.
Answer has been edited:
After clicking to reload it:
(Browser: Chrome v77 - OS: Windows 10 Pro x64)