Indexing ObsCollection always returns "obs" column

[martinvonk]

Not sure why this happens but when I use loc on the ObsCollection the column with the "obs" is always returned

oc_sel = oc.loc[:, ["x", "y"]]
oc_sel.columns -> Index(['x', 'y', 'obs'], dtype='object')

Same happens with iloc
oc.iloc[:, [0,1]]

[martinvonk]

This is the reason why #209 fails

[martinvonk]

Happened to me after updating pandas to v.2.2.2
Updating pandas (2.2.1 -> 2.2.2)

[martinvonk]

Not sure if we need to do something with this. #209 is already fixed.
Maybe if behavior keeps existing after v2.2.2 we need to adress this.

[OnnoEbbens]

It has become an issue in the bro_bronhouder notebook now as well. I think it has something to do with this error: pandas-dev/pandas#57032

[OnnoEbbens]

Geopandas had the same problem: geopandas/geopandas#3060

[OnnoEbbens]

For now I will pin the pandas version to 2.2.1 or lower because this also gives errors in nlmod.