Rdns for ipv6 and automatic diagnosis

My YunoHost server

Hardware: VPS bought online
YunoHost version:
I have access to my server : all except physical
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

as this issue still exists, I thought I might ask again, whether anybody else experiences the same.
(first issue was Rdns for ipv6 occasionally not working?)

My provider set up rdns for my domain.tld. for ipv6 for me.
In general, this seems to be working just fine.
But occasionally (every few days or so) yunohosts diagnosis says:

 No reverse DNS is defined in IPv6. Some emails may fail to get delivered or be flagged as spam 

when I execute something like
host 2a05:my:I:P::V6:Ad:ress:184a
on my local machine, it resolves just fine. (I just did this directly after receiving the diagnosis mail).

Now I’m not sure whether rdns sometimes is not working or whether automatic diagnosis has some kind of problem.
Does anybody experience similar problems with rDNS vor IPV6 and diagnosis?

thanks !!

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