Heya,
The quad9-resolvers.md file downloaded from https://quad9.net/dnscrypt/quad9-resolvers.md is being signed with the old key,
RWQBphd2+f6eiAqBsvDZEBXBGHQBJfeG6G+wJPPKxCZMoEQYpmoysKUN
and not with the new key,
RWTp2E4t64BrL651lEiDLNon+DqzPG4jhZ97pfdNkcq1VDdocLKvl5FW
quad9-resolvers.md from https://raw.githubusercontent.com/Quad9DNS/dnscrypt-settings/main/dnscrypt/quad9-resolvers.md is ok though.