How to cache workers with static assets (beta)?

I used to have my app deployed with

pages

pages

pages

pages I moved to the

worker + assets beta

worker + assets beta

worker + assets beta

worker + assets beta so I can have access to logs.
Unfortunately now my cache hit rate is zero.

In my backend I do:

setResponseHeader(event, "Cache-Control", "max-age=60, stale-while-revalidate=60")

return response

setResponseHeader(event, "Cache-Control", "max-age=60, stale-while-revalidate=60")

return response

setResponseHeader(event, "Cache-Control", "max-age=60, stale-while-revalidate=60")

return response

setResponseHeader(event, "Cache-Control", "max-age=60, stale-while-revalidate=60")

return response

This used to work perfectly with pages, but is not working anymore with workers+static assets