restore search paths after loading file

vyper/compiler/input_bundle.py

@@ -152,6 +152,16 @@ def search_path(self, path: Optional[PathLike]) -> Iterator[None]:
             finally:
                 self.search_paths.pop()
 
+    # temporarily set search paths to a given list
+    @contextlib.contextmanager
+    def temporary_search_paths(self, new_paths: list[PathLike]) -> Iterator[None]:
+        original_paths = self.search_paths
+        self.search_paths = new_paths
+        try:
+            yield
+        finally:
+            self.search_paths = original_paths
+
 
 # regular input. takes a search path(s), and `load_file()` will search all
 # search paths for the file and read it from the filesystem

vyper/semantics/analysis/imports.py

@@ -214,15 +214,19 @@ def _load_import(
         search_paths = self.input_bundle.search_paths.copy()  # noqa: F841
         raise ModuleNotFound(module_str, hint=hint) from err
 
-    def _load_file(self, path: PathLike, level: int):
-        if level == 0:
-            self.input_bundle.search_paths = self.absolute_search_paths
-        else:
-            ast = self.graph.current_module
-            current_search_path = Path(ast.resolved_path).parent
-            self.input_bundle.search_paths = [current_search_path]
-
-        return self.input_bundle.load_file(path)
+    def _load_file(self, path: PathLike, level: int) -> CompilerInput:
+        ast = self.graph.current_module
+        current_search_path = Path(ast.resolved_path).parent
+
+        search_paths = self.absolute_search_paths if level == 0 else [current_search_path]
+
+        with self.input_bundle.temporary_search_paths(search_paths):
+            res = self.input_bundle.load_file(path)
+
+        if level != 0:
+            self.input_bundle.search_paths += [current_search_path]
+
+        return res
 
     def _ast_from_file(self, file: FileInput) -> vy_ast.Module:
         # cache ast if we have seen it before.