Hi, this file has an emtpy cover tag which makes these troubles.
You can remove it, but you must delete both covers.
Easiest way is, you make a new action
Select action type "Remove fields" and enter PICTURE
Or by hand, right click on the cover window in the tag panel, select Remove cover and press Ctrl+S
, repeat.
You can also add a new column to the file list that can indicate you have an empty cover tag.
Use Value: %_covers% - %_cover_size%
If it shows 1 - 0 or 2 - 0 the first cover is empty.