Error 411 - Length required

Hello,
For the last few days I have been doing SEO and speed optimization on Smartstore webshops and I have a problem when using Pagespeed Insights ( https://pagespeed.web.dev/ ) with error 411 - Required length.
 
I tested different versions of Smartstore webshops and the error appears on almost all versions (3.x - 5).
 
Some examples:
https://shop.sacher.com/en
https://unikomerc-uvoz.hr
https://www.multi-power.ro/
 
Does anyone have an idea how to fix this problem?