After the migration, Gutenberg doesn't load on pages and CPTs. But for CPTs, I can activate support for Rest API in MetaBox post settings and then Gutenberg will load.
But I cannot do the same for pages. Metabox doesn't allow to save, because the slug is a system slug.
In Toolset, I had Gutenberg on a case-by-case basis for pages. I switched it to "always", but it doesn't help.
Is there some function that restores Gutenberg on pages?
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