Do I need to add filter twice, once for each post type?
Yes! you can’t insert an array into a string, if you could it wouldn’t result in a matching filter name anyway. The filters for posts and pages are different filters. You need to add them separately.
e.g. postbox_classes_post_my-metabox-api versus postbox_classes_page_my-metabox-api
If I had to guess, your current code results in this filter name: postbox_classes_array_my-metabox-api
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