It happens for me too, I am also getting 500 error both posting Page and Blog.
/wp-admin/post-new.php?post_type=page&calypsoify=1&block-editor=1&frame-nonce=1610150217%3A101098957%3Aaa53e84a91ff7030f9cb3c82d3f526d8&origin=https%3A%2F%2Fwordpress.com&environment-id=production&support_user=&_support_token=
This is what I’m currently running:
WordPress version 5.6
Current theme: Aquene (version 1.0.0)
Current plugin: Amazon Auto Links (version 4.5.0)
PHP version 7.4.13
