Wrong URL for category image when root is set to pub directory

Question

I want to use pub/ directory for security reasons as document root for Magento website but when i switch it, images for categories and for manufacturers (in product detail) are not displayed.

I follow Modify docroot to improve security instructions from Magento documentation and products pictures are displayed well, but URLs for categories and manufacturers images are still generated with pub/ prefix and so it ends with 404 Not found

I use

• GNU/Linux Debian 10
• Apache 2.4
• MariaDB 10.3
• PHP 7.2
• Redis 5.0
• Magento 2.3

Does anyone have an idea what should I do to fix this? Thanks

Update: Few other findings

• Category images are show correctly in admin interface
• php bin/magento indexer:reindex does not help