Qu'as-tu changé exactement?

Dear e pt,
please don't delete demolished railway lines – tag them instead as "railway=razed".
Best wishes

Dear xkrautsc,

please properly rectify the buildings you've mapped. In reality nearly all buildings have rectangular corners. Buildings like way/707141924 for example can't be correct.
If you don't see well enough with Japan GSI please try out the "Maxar Premium" imagery.

Kind regards,
takazu

You should fix such problems in a smart manner and not just run the JOSM validator without any further thought.

Dear sebastic,

why have you destroyed a valid multipolygon: relation/7300115 ?

Dear jdd3,

there are several issues with your changeset. Please take a look at diff view at https://overpass-api.de/achavi/?changeset=66887990

Why have you
* deleted the platform ways at Deerfield?
* created this artifact way/668153669 ?
* cut the railway lines beneath this bridge way/668155605 ?

Please explain your actions and be more careful!