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I assume you want that hidden completely. Also, one point to consider when fixing this- if there are lightning collectors in the unmapped area, will their coverage be included in the discovered map? Or should that area be discovered before showing its coverage? My vote is for the latter since it should remain unknown what coverage may or may not be there until you discover it.
Keep up the good work on the bugfixes!

This is consistent with how Turret range indicators are displayed on the Map view: I don't think this is a bug, since the "range" is just an Overlay on the map; the items being charted are within your explored area. It looks like there are more Lightning Protectors out-of-bounds (in generated but-not-explored chunks) which are not rendered fully, leaving concave "bites" taken out of your Map.

Thanks for the report however this is working as intended.