Meta Revision timing workaround

workaround.php

// do not save revision on post_updated since the meta fields are not saved yet.
remove_action( 'post_updated', 'wp_save_post_revision', 10 );

// readd wp_save_post_revision on save_post if needed.
add_action( 'post_updated', 'save_post_revision_on_save_post', 10 );
function save_post_revision_on_save_post() {
	$mycustomfieldsplugin_save_post_priority = 10;

	// wp_save_post_revision has to be executed after the plugin saves its meta fields (higher priority on save_post hook).
	add_action( 'save_post', 'wp_save_post_revision', $mycustomfieldsplugin_save_post_priority + 1, 1 );
}