Background Images Disappear After Updating To v0.14.0

After updating to updating to v0.14.0 the background images have disappeared from my live site. This problem has occurred on two different sites.

This first site was likely a plugin conflict between the W3TC’s Lazy Load and WebP Express, as disabling WebP Express resolved the problem.

However, the second site I’m having trouble with does not using the WebP Express plugin and does not have W3TC’s Lazy Load feature enabled. To resolve the problem I have had to deactivate W3TC.

The page I need help with: [log in to see the link]