Hello

what dreua is referring to is explained in this part of our wiki:
https://wiki.openstreetmap.org/wiki/Changeset#Geographical_size_of_changesets

@dreua esteemed colleague Pascal Neis has given us a tool, that is capable of showing what happend in change sets with very large bounding boxes. You can find this changeset here:
https://resultmaps.neis-one.org/osm-change-viz?c=147770038#5/52.470/15.026

happy mapping everyone
silversurfer83