Magento 2.3.1 CE visual swatch images showing blank

Question

We have upgraded Magento 2.2.3 CE to Magento 2.3.1 CE recently we have been facing an issue i.e the visual swatch images are not displaying for the configurable product options at frontend details page. Visual swatch images are showing blank. We did reindex and clear flush cache no luck. Verified the same scenario on default magento2.3.1 CE on the local instance it's working as expected.

Please note for a simple product level we selected swatch image option settings as well.

We have an attribute called floats_floatline_size with below settings are at the attribute level

Update Product Preview Image: Yes

Use Product Image for Swatch if Possible: Yes

Please find the attached screenshots and review it and suggest.

Admin end attribute:

Configurable produt options at admin end:

Frontend configurable product:

2. Executed command : php bin/magento catalog:images:resize the catalog/product cache images are generated but not calling in the frontend.

3. varnish & cloud front cache from magemojo server ui interface but No luck

4. Not facing this issue on local same instance with same code and modules.

Please review and advise?