DateTimeField with auto_now_add=True option can not be updated with value

[M1ha-Shvn]

Example

class MyModel:
  dt = DateTimeField(auto_now_add=True)
  
obj = MyModel.objects.create()

MyModel.objects.pg_bulk_update({1: {"dt": datetime(2024, 1, 1, tzinfo=pytz.utc}})

obj.refresh_from_db()
print(obj.dt)

I expect date to be updated here, but it is not updated due to the usage of NowSetFunction(if_null=False). It ignores provided value, and as a result of COALESCE function leaves value unchanged.

[M1ha-Shvn]

Temporary fix: use set_functions={"dt": "eq"}