It’s quite hard to troubleshoot without seeing the actual issue.
Just to confirm: it is working on version 3.3.3, but it does not work on versions 3.3.4 and 3.3.5, correct?
If that’s correct, it’s a very unusual situation, likely not directly related to WooCommerce, because there were no big changes when it comes to how WooCommerce handles images between versions 3.3.3 and 3.3.5.
It could be that your theme template is not fetching the image correctly, or is fetching the wrong size of the original image. Or the images might not be accessible, or something else entirely.
Few things you can test:
* What happens when you remove the image from the product and add it again?
* Does this happen while creating a new product, or just on existing products?
* Are your images served via a CDN or from the server where the site is running?
* Are you using any image-related plugin?
* Have you tried to disable all your plugins except WooCommerce to see if the images show up correctly?
* Has your theme been updated recently?
* Have you tried using a plugin like https://www.ads-software.com/plugins/regenerate-thumbnails/ to refresh your site’s thumbnails?
If you can not make the site accessible, at least send more information that might help people get a better context of the issue.