Does Google Overcache Their DNS for Email?

I recently moved away from GSuite (to a paid email proviuder), and while my new provider is working great...I am seeing the odd email or 2 slip back into the Google inbox side. All DNS (MX, SPF, etc.) had been updated to point to my new provider...and yet, every once in a while maybe once per 2 weeks, I see an email message show up in the google inbox. Thankfully, it is not an important email message; they all have tended to be marketing emails. But, has anyone else experienced this? My theory is one of the following: 1) One of Google's servers is stuck with old DNS info and still routing some emails to themselves/Google. 2) Or, some other DNS server out there is stuck sending messages towards Google...and Google is happy to receive them.

I still have access to the google account associated with the legacy GSuite, but it simply doesn't send (so that part at least works fine) - which is why i was able to discover this little bug. Am I the only one experiencing this? I'm trying to give Google the benefit of the doubt, and assume this is simply a bug, andf not some greater conspiracy...but would love to hear if anyone - especially those who moved away from GSuite - is seeing this too. Thanks in advance!