Does this pattern repeat? That is, do you get a 403 CAA Recheck error followed by the 405 Method Not Allowed followed again by CAA Recheck then 405 and so on?
No, the 403 error occurred only once. Now I have the rate limit error "too many certificates (5) already issued for this exact set of identifiers in the last 168h0m0s", which is sad since I still did not get any certificate due to 405 error.