Importing: non-default multiple value separator can't be used in additional_images column

[gediminaskv]

Preconditions

1. Mage 2.1.8 and earlier
2. PHP7

Steps to reproduce

1. Generate CSV file for product images import with fields: sku , additional_images etc.
2. Use different multiple values separator ie ;
3. Add some images to additional_images row.

Expected result

1. Product images imports successfuly.

Actual result

1. Get an error during importing process: Wrong URL/path used for attribute additional_images in row(s)...
2. If you use default multiple value separator , (comma), import goes well. It throws an error when something different than comma is used to separate image files. It only happens with additional_images column!

[magento-engcom-team]

@gediminaskv, thank you for your report.
The issue is already fixed in 2.2.0