When you fully zoom in in map mode into a region without radar coverage and then hover over an entity you can still see all the entity info including a detailed picture of it. With this bug for example you can see what items are on a belt by hovering over it without actually being able to see the belt clearly in the map view.
I don't think the info should be visible/detailed when you do not have radar coverage.
Here's a pic which shows it:
[0.15.0] Entities info visible in zoomed in map mode
Re: [0.15.0] Entities info visible in zoomed in map mode
Thanks for the report. I've fixed it for the next version of 0.15.
If you want to get ahold of me I'm almost always on Discord.