Argless class signature not shown

[ego-thales]

Describe the bug

Hello everyone,

I noticed that if a class constructor expects no argument, then the signature (<Signature ()>) is not redenred. I don't know if this is a design choice or a bug, but I couldn't find an option ot overrule this.

Here are screens of two renders with the same config. One shows the signature, not the other, presumably since it is argless:

How to Reproduce

class A: ...

.. autoclass:: A

Environment Information

sphinx v8.2.3
python 3.13
ubuntu 22.04

Sphinx extensions

extensions = [
    "sphinx.ext.autodoc",
    "sphinx.ext.autosummary",
    "sphinx.ext.napoleon",
    "sphinxcontrib.bibtex",
    "sphinx.ext.viewcode",
]

Additional context

No response