“It’s strange, there is no “wp_enqueue_block_style()” function in blocks.php normally.”
Actually there is, but it’s in version 5.9:
https://github.com/WordPress/WordPress/blob/6437203f0997da70714a6c4ff9cdcd96cc6ddf8f/wp-includes/blocks.php#L1206
I had a same issue and I think it’s because your WordPress installation has version 5.9 and 6.0 mixed together for some reason. In my case it happened because I tried to restore earlier backup (5.9) after upgrading to 6.0.
