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Hi,

Thank you for testing. Looking at the environment details again: my original report listed PHP 8.3.30, which differs from the PHP 8.4.12 used in your test environment. WordPress version (7.0.2) and Post Snippets version (4.2.1) match.

To clarify the snippet’s history: variables have never been added to this snippet — it was created without variables from the start and has never had any set or removed.

I confirmed a fix works by manually patching line 723 in PSallSnippets.php ($atts = $attributes["snippetVars"] ?? [];) and line 44 in Shortcode.php (foreach ((array) $atts as $key => $val) {) — after applying this, the warnings disappear immediately. This suggests that in my case, $attributes["snippetVars"] is either null or the key is missing entirely when the shortcode is rendered.

The PHP version difference (8.3.30 vs 8.4.12) may or may not be relevant, but it’s the only environment difference I can identify. I’ll leave this information here in case it’s useful. Thank you again for looking into this.