Inefficient query in XF\ReactionAbstractHandler::updateRecentCacheForUserChange

[Kirby]

PHP:

Code:

\XF::db()->query("
    UPDATE (
        SELECT content_id FROM xf_reaction_content
        WHERE content_type = ?
        AND reaction_user_id = ?
    ) AS temp
    INNER JOIN {$table} AS reaction_table ON (reaction_table.`$primaryKey` = temp.content_id)
    SET reaction_table.`{$recentField}` = REPLACE(reaction_table.`{$recentField}`, ?, ?)
", [$this->contentType, $newUserId, $oldFind, $newReplace]);

This query tries to update all records for $newUserId, even those...

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