True, both are artwork that does not change for dark/light mode, but they work with either.
Yes, the auto-complete options artwork is somewhat outdated, but it gets the point across. The next iteration of that artwork will need to be scalable graphics, so that will be quit a bit of work to put together for me (that's why I keep putting it off ;-) )
The lightbulb is supposed to show up when auto-complete becomes active. Looks like there is a new bug there. Good catch. A substantial portion of auto-complete was re-written for performance in this release.