Can not get message from folder

[flim]

Version used: 4.1.2 Php 7.2

I can fetch all folders using getFolders. I can count messages in a specific folder using $folder->messages()->all()->count(); But there is no message inside when I do $folder->messages()->all()

Webklex\PHPIMAP\Support\MessageCollection^ {#3188
  #total: 2
  #items: []
  #escapeWhenCastingToString: false
}

Did I misconfigure the client ?

Thank you