SAML Request invalid format

[colinet]

It looks like SAML request valid format is

<samlp:AuthnRequest
xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
...
saml:Issuer${ENTITY_ID}</saml:Issuer>
</samlp:AuthnRequest>

Current SAML Request format generated by flask_saml2 is :

<samlp:AuthnRequest
xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
...
<saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">${ENTITY_ID}</saml:Issuer>
</samlp:AuthnRequest>

Not sure whether this is a bug or whether both formats are valid.