Repro

1. import product with base_image, additional_images (additional_image_a, additional_image_b)
2. check database table catalog_product_entity_media_gallery_value
   1. expected: base_image has position 1, additional_image_a has position 2, additional_image_b has position 3
   2. actual: all images have position 1

Information
The (generated) file media_*.csv contains a line for each image and may contain several lines for a specific sku.
The observer techdivision/import-product-media/src/Observers/MediaGalleryObserver.php gets executed for each line of that csv and resets the position counter in line 105.
Later the observer techdivision/import-product-media-ee/src/Observers/EeMediaGalleryValueObserver.php is executed and reads (and increments) the position counter.
For each line of that csv file the observers are executed in this order and therefore each gallery_value is persisted with position = 1.

Aktuell besteht die Möglichkeit, über das Feld additional_images diverse Bilder zum Produkt zu importieren, sowie über das Feld additionals_image_labels die dazugehörigen Images Labels zu vergeben. Das darauf folgende Feld (hide_from_product_page) wird allerdings aktuell nicht beachtet.

Hier sollte es möglich sein, eins oder mehrere Bilder, die innerhalb der additional_images angegeben sind, für das Produkt im Bezug auf einen bestimmten Store, als hidden zu markieren.