Image variants missing in auto generated bean

The "Build a Website" tutorial project, when upgraded from 13.2.0 to 13.3.0, shows a bug, most likely in the auto-generation of content beans.

Reproduction path:

1. Clone/checkout website-tutorial project, branch iteration-13.2.0:
   https://github.com/bloomreach/website-tutorial/tree/iteration-2-13.2.0
2. Build & run
3. Point browser to http://localhost:8080/site/products and note the product images are correctly displayed (see screenshot 13_2.png)
4. Stop application, remove repo storage folder
5. In root pom.xml change parent pom version from 13.2.0 to 13.3.0, do the same for Essentials version (defined in properties)
6. Do a clean build and run
7. Point browser to http://localhost:8080/site/products and note the product images are not correctly displayed (see screenshot 13_3.png)

Note that:

• While above reproduction path simply upgrades the existing 13.2.0 project, I've confirmed the same behaviour in a newly built tutorial project started from a clean 13.3.0 project.
• The project has defined a custom imageset (created using Essentials), gogreen:imageset
• The relevant document type is gogreen:product, the relevant field gogreen:images (multi-valued image link field)
• The relevant Freemarker template is repository-data/webfiles/src/main/resources/site/freemarker/gogreen/productslist.ftl
• This blocks updating the tutorial to 13.3.0 for the public availability.

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Update:
Same issue occurs at homepage (featured products below banner carousel) and product detail pages:

• http://localhost:8080/site/
• http://localhost:8080/site/products/solar-centurian---outdoor-security-light.html