No more option to delete all files from my onedrive recycle bin

I can't empty anymore my onedrive recycle bin at once, when i select all the files in the onedrive recycle bin the option "delete" is no more presented, only the option "restore" is.

If I empty it thru the "manage storage" page and the "empty recycle bin" hyperlink, files are still there even hours later.

The only option is select a single file at a time and use the 3 dots menu where the option "delete" is presented. But as this is file by file, this is of course completely unefficient and therefor unacceptable.

I just find out that i can select maximum 50 files to delete them all at once. Starting from 51, the option disappears... Unbelievable?!