[Escalated to WPML Developers team] Found a few issues in your code
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1. Yes, using an external cache. (however this will also give a notice as of WP 6.1 when not using external cache, as there are some discussions with core committers atm what types will be validated, but null will definitely give an error)
2. sorry, I don't have it anymore. We fixed this issue by doing:
if ( is_null( $trid ) ) {
return null;
}
in translation-management.class.php at beginning of function get_translation_job_info and change return type to array|null in phpdoc (and $trid type to int|null)
