Some headers of pandas dataframe are shown as attributes but no all in Debug > Variables in VSCode

I'm trying to debug a dataframe df that has a lot of columns (809) and one row. I've created it like this :

df = pd.DataFrame([prepared_line], columns=headers)

where prepared_line and headers are list. Values in headers are a mix between CamelCase and snake_case thus there is no space.

When I look for df in the DEBUG tab of vscode, I can see that some of the columns headers are shown like this (note the App* attributes) as Series:

But not all of them (probably because there is 809 of them) and what I find strange is that, even though this is in alphabetic order, some headers are not displayed.

Is this normal for a pandas dataframe to be displayed like this in vscode or is there something I'm missing?

Headers that are displayed are Series, from what vcsode tell. Does vscode debug only display Series and if so why my columns are not all Series ?

Thanks in advance for any help,

I hope this is the correct place to ask.