Importing a WP 6.3 exported site with block theme results in CSS problems [with solution]

Just following up here with some more info - this is indeed an issue in WordPress and a Trac ticket is open for it - #59111 (A stale register_core_block_style_handles cache can cause styles not to load) – WordPress Trac

In the meantime, an even easier fix is noted in that ticket - Opening a Site Shell in Local for the sites affected and running this command will resolve the issue:
wp transient delete wp_core_block_css_files

We’ll stay on top of that Trac ticket and keep pushing it along where we can.

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