I observed many times indentation issues for modern Python 3.

For examples:
```
class Foo:
def __init__(self, ...):
self.foo = ... # TAB won't indent to pos+4
```

A workaround is sometimes to close and reopen the file.
Thus I suspect a wrong state.
But I don't found any explanation.

I am using Python mode with treesitter enabled but I think it is not yet 
used for indentation ???

---
In GNU Emacs 29.3 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 
3.24.41, cairo version 1.18.0) of
2024-03-25 built on 8d1efaa99cf549ff83f11657c3f4678a
Windowing system distributor 'The X.Org Foundation', version 11.0.12302006
System Description: Fedora Linux 39 (Workstation Edition)

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