RecursionError: maximum recursion depth exceeded (0.26.1 -> 0.26.2)

[sberryman-mh]

Describe the bug
I upgraded from 0.26.1 to 0.26.2 and am now getting a maximum recursion depth exceeded.

To Reproduce

Schema (snippet):

      "NullableArticle": {
        "properties": {
          "title": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "title": "Title"
          },
          "date_published": {
            "anyOf": [
              {
                "type": "string",
                "format": "date-time"
              },
              {
                "type": "string",
                "format": "date"
              },
              {
                "type": "null"
              }
            ],
            "title": "Date Published"
          }
        },
        "type": "object",
        "title": "NullableArticle"
      },

Previous output:

class NullableArticle(BaseModel):
    title: Optional[str] = Field(None, title="Title")
    date_published: Optional[Union[AwareDatetime, date]] = Field(
        None, title="Date Published"
    )

New output:

class NullableArticle(BaseModel):
    title: Optional[str] = Field(None, title="Title")
    date_published: Optional[Union[datetime, date]] = Field(
        None, title="Date Published"
    )