After rfc -i the generated file /var/cache/rfc/rfc-index doesn't contain the required index. See attachment for actual content. Reproducible: Always
Created attachment 245258 [details] Content of the file rfc-index
Confirmed, same here.
Created attachment 270245 [details, diff] this patch help add this patch, add 'epatch "${FILESDIR}"/rfc.patch' in ebuild func src_unpack() => all work
Comment on attachment 270245 [details, diff] this patch help Didn't apply properly, so I rewrote it.
Fixed in -r1.