Category page with thumb is ok but can’t do the same with tags

What am i missing?

‘tag’ may be a valid argument for get_posts() via WP_Query, but requires the tag slug in that case. Try using ‘tag_id’ instead.

get_posts() apparently enables ‘category’, but expects the the ID, even though in WP_Query the same argument is ‘cat’ (vs. ‘category_name’, et al).

A little confusing, perhaps, altogether. I know it still confuses me.

https://codex.wordpress.org/Template_Tags/get_posts
https://codex.wordpress.org/Class_Reference/WP_Query#Parameters

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