WordPress/Woocommerce have a big SEO problem ?

hi, today I noticed some strange things on my site using the “Fetch as Google” tool of google search console.

If I try to see a category or a product of my site known that google tells me that some files (js, css or images) can not be loaded because are “Temporarily unreachable”, these files are on my domain and there are no limitations in the robots.txt file

I tried to disable all the plugins and change the theme, I changed the server but I noticed the same problem even on new installations.

I tried to see if through the tool https://search.google.com/test/mobile-friendly

also the site https://woocommerce.com/ had this problem, I noticed that it has the same problem, some files (js, css, images) are blocked

Note that this problem occurs when the user agent “Googlebot for smartphone” is used, in fact if you use the tool “Fetch as Google” of google search console you will notice some differences with the one normally seen by a user.

How do you explain this? is it a google fault? or is there any problem in woocommerce?