mypy error: defining a Quantity as multiplication of list and unit raises an error

[Luna137]

With the newest version of pint, running mypy on the following script

import pint

ureg = pint.UnitRegistry()[
unit_of_length: pint.Unit = ureg.m](b: pint.Quantity = [1, 1, 1] * ureg.m)

returns the following error:

error: Incompatible types in assignment (expression has type "list[int]", variable has type "Quantity")  [assignment]
error: Unsupported operand types for * ("list[int]" and "Unit")  [operator]

Is this meant to happen, or is this a bug?