When whitespace-mode is enabled, single-line copilot completions makes
the cursor look like it's at the end of the completion rather than in
it's real position.
Issue with gifs showing the behavior is here:
https://github.com/zerolfx/copilot.el/issues/28
For the most part I should be able to live without whitespace-mode in
day to day use, and improvements to the highlight-indent-guides setup
should help.
And worst case, whitespace-mode can always be toggled easily enough.