The datetime input type is obsolete and apparently unsupported in browsers:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/datetime
...in favor of datetime-local.

Halogen 3.0 noted this and removed it from the Properties module, but that change didn't make it into this library. See:
2.0.1
3.0.1

Some packages break when updating to Halogen 3.0.1 because of this (for example, the purescript-markdown-halogen package.