Running with mypyc ends up with placeholder types where there shouldnt be

[davfsa]

When running mypyc on my project, I ended up with some errors that dont occur when running mypy normally (it passes mypy strict with no errors/warnings). I havent been successful to extract the error in a different environment, so I have attached the relevant pieces of code with permanent links to them. If any more information is required or if someone could point me in the right direction to fix this, would be glad to :)

Mypy code: https://github.com/python/mypy/blob/5039c0fe44a7592b2fcb07cead49d921ecea211f/mypy/typeanal.py#L1037
My code: https://github.com/davfsa/hikari/blob/06271cfae9919b5256916120840359275e2848b2/hikari/messages.py#L510-L557

class ButtonStyle(enums.Enum):
    PRIMARY = 1

    SECONDARY = 2

    SUCCESS = 3

    DANGER = 4

    LINK = 5

InteractiveButtonTypesT = typing.Union[
    typing.Literal[ButtonStyle.PRIMARY],
    typing.Literal[1],
    typing.Literal[ButtonStyle.SECONDARY],
    typing.Literal[2],
    typing.Literal[ButtonStyle.SUCCESS],
    typing.Literal[3],
    typing.Literal[ButtonStyle.DANGER],
    typing.Literal[4],
]

The 4 logs on top are the output of printing arg in the before mentioned mypy code

<placeholder hikari.messages.ButtonStyle>
<placeholder hikari.messages.ButtonStyle>
<placeholder hikari.messages.ButtonStyle>
<placeholder hikari.messages.ButtonStyle>
hikari/messages.py:540:5: error: Parameter 1 of Literal[...] is invalid  [misc]
        typing.Literal[ButtonStyle.PRIMARY],
        ^
hikari/messages.py:542:5: error: Parameter 1 of Literal[...] is invalid  [misc]
        typing.Literal[ButtonStyle.SECONDARY],
        ^
hikari/messages.py:544:5: error: Parameter 1 of Literal[...] is invalid  [misc]
        typing.Literal[ButtonStyle.SUCCESS],
        ^
hikari/messages.py:546:5: error: Parameter 1 of Literal[...] is invalid  [misc]
        typing.Literal[ButtonStyle.DANGER],

This differences from standard mypy, where it completes without any problems.

[davfsa]

Possibly related to python/mypy#12911