Ok that was interesting, just updated another body with 0ls distance from the star, and what a strange error. Fortunately I took screenshots of the EDSM page before jumpingin, the reason in this case there was 0ls distance from the star was because....there was no star!
Here is the main EDSM system summary page and bodies page before I jumped in;
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Note of interest here, the system summary shows one body, and that body is the planet 7 with basically no information at all! So of course no distance to the star. The detailed view however shows it was scanned and mapped by [ZLO]FeNRiR, so this was after the introduction of the FSS.
So, what changed on EDSM after I jumped in?
The first interesting is it shows me as the first player to report the system to EDSM, even though [ZLO]FeNRiR's tag is actually on the star.
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The system summary now shows full details, 11 bodies altogether;
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We now have a star.
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And a fully detailed report on body 7 with the correct image.
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The only thing I can assume from this change is that whatever the original visitor to the system was using, only the data reported from the surface scanner and probes was forwarded to EDSM, the scan data from the FSS was never forwarded, this may give us some help in tracking down what is actually causing these errors.