In my defense, I will argue sort of self-incompetence. I was casually mapping around the region it  left me after the tutorial. So I think I touch 2 things (that now raise warnings on changeset/17325038).

While I was ready to save the changeset, iD gave a warning about the things I touched (not the ones I created with iD). Not sure what I did, but maybe I attempted to do some suggestion it made (if it was a like without tags, maybe I just added marks like other roads I was doing (but not really aware the line was so huge like noticed weeks later after discovering that there are tools to detect these things).

The warnings sort of snowball with more warnings after trying to fix the current ones (it think it was the first time iD showed an error for something I didn't create myself) and eventually I just clicked save with the suffix "(migth have issues here)". After all, what could possibly go wrong?

So now a tool called OSMCha (which sort of is better to visualize the changes, but did not know it exist) says my changeset 127073124 has "Mapbox: Fictional mapping" (which is factually true) And also is factually true that I ignored the iD warnings. Sorry.