Since this looks like it will take a little bit to track down, what about turning this into an issue and responding with that? So, something like?
Thanks so much for your email, and apologies for our delayed response. This is an interesting one, and it will take us a little time to investigate. So that we can continue to follow up on it, we've created an issue (link to issue).
If you have anything else to include about what you've encountered, it would be great if you could add more information there, and you can follow along with our progress.
Thanks so much for bringing this to our attention and for using TimeGPT!
Best regards,
Nixtla team