steps to reproduce- place a square 3 or more tiles on it's side of tiny solars, then super-force build regular solars 1 tile away from the edge. allows insane amounts of solar in the same amount of space as a few regulars
works best on space platform as building is instantly queued

Hey there,

so, impressively, it seems you've found a base game bug that also applies to most other mini / micro machine mods! Osmo has made a bug report on the forums: https://forums.factorio.com/viewtopic.php?p=692544#p692544

Depending on the answer, I'll remove the fast replacements group or leave it be.

Thanks a lot for your report!

After the response by Wube staff, I (and Kryzeth) have elected to change the fast_replacement_group for tiny solar panels. (1.0.9)

Thank you for the report!