My Dynamic XML Sitemap is acting weird, any Laravel SEO wizards?

Alright folks, I just launched a new Laravel app, and naturally, I'm using our very own 'Dynamic XML Sitemap' package – you know, the one that promises auto-updating and future-proofing, practically making your SEO life a breeze. Well, it seems my sitemap decided to get a mind of its own lately. The <lastmod> dates in the XML are behaving erratically, and it's driving me nuts. They're not updating consistently for all pages, especially for older, unchanged content. It's like the sitemap is selectively ignoring updates or just assigning completely inconsistent dates, which, as you can imagine, is absolutely hindering our Laravel SEO efforts. I'm scratching my head trying to figure out if it's some obscure package quirk with specific page types, or perhaps some sneaky server-side caching (Nginx/Redis) that's interfering with the sitemap generation process. Could it even be an overlooked Laravel configuration for timestamp handling that I'm just completely missing? Has anyone else experienced similar <lastmod> date issues with dynamic sitemaps? Are there common server caching pitfalls that specifically affect sitemap generation that I should be aware of? And beyond just checking the database, are there any advanced debugging strategies for <lastmod> discrepancies that you'd recommend? I'm really seeking some practical advice to resolve this rather annoying issue. Help a brother out please...