Laravel SEO sitemap issues!

I'm completely stuck trying to get my dynamic XML sitemap working right in my Laravel SEO project. It's driving me crazy! My auto-updating sitemap, which is absolutely crucial for our new Laravel application, just isn't behaving as expected. I'm using a custom solution, similar to a 'Dynamic XML Sitemap for Laravel & All Websites' approach, to generate an always-current sitemap for a large, frequently updated content site built on Laravel. The specific issue is that the sitemap either doesn't reflect new content immediately, or it's throwing validation errors when I submit it to Google Search Console, even though the URLs look correct when I manually check them. Sometimes, it even seems like old, deleted pages are still lingering, which is a nightmare for SEO. I've tried clearing all Laravel caches (php artisan cache:clear, config:clear, route:clear), regenerated the sitemap multiple times, and even manually inspected the generated XML for malformed tags or incorrect URLs. I've also checked my cron jobs to ensure the update frequency is correct, but nothing seems to consistently fix it. I'm completely out of ideas and this is such a critical SEO component for our launch. Has anyone encountered similar persistent issues with dynamic sitemaps in Laravel, especially regarding timely updates or those frustrating validation errors? Anyone faced this before?