How to create a permalink structure with custom taxonomies and custom post types

I suspect the extra slash is coming from the str_replace action because normally there’s no need to manually add slashes when retrieving TAX urls.

Since you now end up with 1 unwanted slash, I would recommend testing situations with/without the slash. Starting with removing the one in the function definition. Make it empty, see what happens.

That is the first step to look into, in my opinion. I think this post might help you a bit as well: https://codex.wordpress.org/Debugging_in_WordPress

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