Is this on an OS with case-insensitive files? We've had some similar issues.

Happens on wsl and not windows

Can you delete your mypy cache and then check if the following patch fixes:

diff --git a/mypy/fscache.py b/mypy/fscache.py
index c77b941c5..fb651326f 100644
--- a/mypy/fscache.py
+++ b/mypy/fscache.py
@@ -202,9 +202,6 @@ class FileSystemCache:
 
         The caller must ensure that prefix is a valid file system prefix of path.
         """
-        if sys.platform == "linux":
-            # Assume that the file system on Linux is case sensitive
-            return self.isfile(path)
         if not self.isfile(path):
             # Fast path
             return False

@hauntsaninja did you know that github supports diff as a code block language.

diff --git a/mypy/fscache.py b/mypy/fscache.py
index c77b941c5..fb651326f 100644
--- a/mypy/fscache.py
+++ b/mypy/fscache.py
@@ -202,9 +202,6 @@ class FileSystemCache:
 
         The caller must ensure that prefix is a valid file system prefix of path.
         """
-        if sys.platform == "linux":
-            # Assume that the file system on Linux is case sensitive
-            return self.isfile(path)
         if not self.isfile(path):
             # Fast path
             return False

I knew that. Does the diff fix the issue or not? (I don't have a system I can repro the issue on)

testing it now

I think that change resolves the issue

Very strange, on another machine with the exact same files it doesn't follow the imports at all.

Raised it here #11697

Happens on wsl and not windows

Is this happening on WSL 1 or 2? Also, are you using the Windows file system or the Linux file system?

wsl 2 on the windows file system, it does not happen with wsl + linux fs