Why would I get a “Trying to access array offset on value of type bool” warning when using “metadata_exists()” in save_post?

Thanks to mmm’s comment above, it was pointed out that even for CPTs the first parameter’s value needs to be “post”, as clearly stated in the documentation at https://developer.wordpress.org/reference/functions/metadata_exists/.

Somewhere along the way I confused myself into thinking that the first parameter’s value needed to be the CPT handle for a custom post type (CPT), which was NOT correct. Thanks again mmm, and apologies for my oversight.

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