Com essa resposta, consegui obter o CNPJ que é realmente enviado na requisição. O mesmo confere com o da filial e não com o do certificado.
Adicionei o XML de Emissão e a requisição gerada em NFePHP\NFe\Tools\sefazEvento() em anexo.
<envEvento
xmlns="
http://www.portalfiscal.inf.br/nfe" versao="1.00">
<idLote>202503061758034</idLote>
<evento
xmlns="
http://www.portalfiscal.inf.br/nfe" versao="1.00">
<infEvento Id="ID1101113525030604879000067665000000003041110336297201">
<cOrgao>35</cOrgao>
<tpAmb>1</tpAmb>
<CNPJ>06048790000676</CNPJ>
<chNFe>35250306048790000676650000000030411103362972</chNFe>
<dhEvento>2025-03-06T17:58:03-03:00</dhEvento>
<tpEvento>110111</tpEvento>
<nSeqEvento>1</nSeqEvento>
<verEvento>1.00</verEvento>
<detEvento versao="1.00">
<descEvento>Cancelamento</descEvento>
<nProt>135250325605115</nProt>
<xJust>Desistencia do comprador no momento da retirada</xJust>
</detEvento>
</infEvento>
<Signature
xmlns="
http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod Algorithm="
http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
<SignatureMethod Algorithm="
http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
<Reference URI="#ID1101113525030604879000067665000000003041110336297201">
<Transforms>
<Transform Algorithm="
http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
<Transform Algorithm="
http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
</Transforms>
<DigestMethod Algorithm="
http://www.w3.org/2000/09/xmldsig#sha1"/>
<DigestValue>f+sA/+qL7DAlj0LsxNz1x2xLhMc=</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>GbwK+GIP5D8jZgP8Di6IFdaUX6RHpS66jWnyoRvojPcISL0V/+BXptBcEq0rHF5mbO7joGYPhxX3qW14HF+b/1//gN6+m8WOD3evdHF56crWnSyDu9nhnN7sN4pukQkA3k4d6HcNZNM+cpLUQg/x/kts4U3X8/cTGDxF7zj3i5DI6TSHnSabzcNZLEM/jrfAZjnuErZK3rMacq5RJjZN7UoKJIai15DuAimUx450/actL8Z6dPEfViQtBeTlslEIIgqbgTr6tIJGMGMO5cn8ieoEw7Nu0spYG+QWt3VkMqD3Ms3ycCETM+ic6sARSCAomt0LfnzlgBJ1FYzXqqdrTA==</SignatureValue>
<KeyInfo>
<X509Data>
<X509Certificate>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</X509Certificate>
</X509Data>
</KeyInfo>
</Signature>
</evento>
</envEvento>