The index.php file is the fallback template file when no other templates have been found. For a FSE theme this should never be run except when Gutenberg is not activated.

// Apparently this can be empty.
_e( 'Activate Gutenberg to use the "This is" theme', 'thisis');
_e( 'You also need an index.html file in block-templates', 'thisis');


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    WordPress version: 5.7.2

    Gutenberg version: 10.8.0

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