Every time I try to use Ipv6, I run into dozens of weird issues and bugs and my selfhosted stuff becomes unusable/unreliable.
I don't know where the issue exactly lies in the chain of networking, but it sure is annoying as a motherfucker to debug. As far as I can tell none of my stuff is the problem and the issue lies either with my ISP or VPS provider.
For now, I removed the AAAA entries and suddenly everything works without any hiccups. Wake me up when those issues are solved... maybe in 10 or 20 years...

Not as mature as ipv4 apperantly.
ipv6 works fine on my intranet.
If big company A or B can't get their shit together don't blame the victim. But if you don't believe me, I invite you to a debugging session. Honestly I'd be happy to be proven wrong if it works in the end.