OpenAlex is still very new, and so you'll encounter some bugs as you look through the data. This page documents the ones we currently know about.
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Some dates, notably publication dates, come from external sources like publishers and are included in OpenAlex as-is. Dates in the future can be especially suspect.
https://openalex.org/W4205467938 has a publication date of 2023-01-31, for example (if you're reading this after February 2023, that date used to be in the future). This date came from publisher-submitted Crossref metadata for this article. Looking at https://dl.acm.org/doi/10.1145/3485132, this does seem to be part of an ACM issue-in-progress with a print publication date of 2023-01-31.
https://openalex.org/W4200151376 has a publication date in 2029. This also comes from the publisher's Crossref metadata, but it's less plausible that the journal has an issue planned that far in advance. On https://doi.org/10.12960/tsh.2020.0006, we see an accepted date of 2019-12-21 and a publication date of 2029-01-31, suggesting that the latter is a typo and the publication_date is wrong.