Multisite on wpengine

I have to sites joined by multisite on wpengine:
main https://dglofox.wpengine.com/ – where all works perfectly,
and subsite https://dglofox.wpengine.com/blog/ – where plugin not works

And strange thing, the file from theme folder converted to webp https://i.imgur.com/kM4zXC5.png
while all others files from uploads folder are remain the same https://i.imgur.com/vKLWCFY.png (sorry for transparent tooltip, it hides while I press screenshot hotkeys)
it’s look like subsite can access only files from theme folder, and can not access from “uploads” subsite folder. Maybe because it “separate” https://i.imgur.com/gmbj3P1.png . And or plugin not processing this path or rules not valid. The rules tech support are setting up from wpengine article https://wpengine.com/support/webp-image-optimization/

Can you give some advice what’s I doing worng? Guys from wp engine supports thinks the rules are ok and suggest I’ll write to you about this. Thanks!

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