Cannot remove read access to a subfolder of a team folder

[adriansev]

I'm trying to have the following structure:
team_folder1 which have two subfolders : public and private
there are two groups allowed on team_folder1 : public (read-only rights for public group and full rights for private group) and private_group (full rights for private group, NO rights for public group)
i'm trying to restrict the access on private sub-folder only to private group (so to remove the read right for public group on private sub-folder) but i get the error that i cannot remove read permission for myself (but i'm part of the private group that have full rights).
It seems to me that not all permissions from all groups are counted for when deciding that i cannot remove read permissions for myself.