Does automatic extension apply to Schengen "waiver" entry?

That's true. According to the decree law, this applies to all visas and documents. They don't specify which ones. So it's assumed that all visas are covered, including the Schengen visa. But you can enquire it at a SEF office, just to make sure.

Article 16

8 - Documents and visas whose validity expires from the date of entry into force of this decree-law (24 november)  or within the 15 days immediately preceding it shall be accepted under the same terms until 30 June 2024.

9 - The documents referred to in the previous paragraph will continue to be accepted, under the same terms, after 30 June 2024, provided that the holder proves that they have already made an appointment for their renewal.

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Decreto-Lei 109/2023, de 24 de novembro 2023

Artigo 16.

8 - Os documentos e vistos relativos à permanência em território nacional, cuja validade expire a partir da data de entrada em vigor do presente decreto-lei ou nos 15 dias imediatamente anteriores, são aceites, nos mesmos termos, até 30 de junho de 2024.

9 - Os documentos referidos no número anterior continuam a ser aceites, nos mesmos termos, após 30 de junho de 2024, desde que o seu titular faça prova de que já procedeu ao agendamento da respetiva renovação.

Law:

https://diariodarepublica.pt/dr/detalhe … -224728395

@JohnnyPT

Thank you again Johnny!

Can we simply walk into an SEF office and make an inquiry?

Sure.

https://aima.gov.pt/pt/a-aima/servicos/lojas-aima

Take a print screen of my post above.