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Changes between Initial Version and Version 3 of Ticket #56664

initial	v3
1	1	There's a small error in the `register_block_style_handle()` function which prevents us from properly determining if a stylesheet for a block exists or now.
2	2	We use `$style_path_norm = wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $style_path ) );` to get the stylesheet's path, and then we check if the file exists by doing `$has_style_file = false !== $style_path_norm;`.
3		The problem is that `realpath()` returns`false` if the file does not exist, however it then passes through `wp_normalize_path()` and the `false` value gets converted to an empty string.
	3
	4	The problem is that `realpath()` returns`false` if the file does not exist, however it then passes through `wp_normalize_path()` and the `false` value gets converted to an empty string - therefore making the `false !== $style_path_norm` condition to fail.