FYI, I was on 1.4.0 w/ the local binary, and am able to reproduce the issue w/ the 1.4.0 amd64 docker image

docker run --env SPICEDB_GRPC_PRESHARED_KEY='9o5Nnk93O8Am$isH%G#Fav6$7g!cdnP%W0S@E!s2Q7nU$6hrDVIR4Ss4OtTsnhue' --env SPICEDB_GRPC_NO_TLS=true --env SPICEDB_HTTP_NO_TLS=true -p 50051:50051 quay.io/authzed/spicedb:v1.4.0-amd64 serve