By looking at e8422f0 It seems like you've moved v2.0.0 tag, which is very unfortunate and should be avoided.

The problem is that proxy.golang.org already captured original v2.0.0 tag so now we have a situation when having
GOPROXY=https://proxy.golang.org gomods get lHNQverf0+Gm1TbSbVIDWVXOhZ2FpZopxRqpr2uIjs4= hash of the module
and with GOPROXY=direct gomods getting OyHbl+7IOECpPKfVK42oFr6N7+Y2dR+Jsb/IiDV3hOo=.

To resolve the situation please tag v2.0.1, and please never ever move tags between commits.

Example of affected go.sum file: kubernetes-sigs/cluster-api#1217