Prevent stats loss

Author: jacobtylerwalls

doc/whatsnew/fragments/9059.bugfix

@@ -0,0 +1,5 @@
+Prevented data loss in the linter stats for messages relating
+to the linter itself (e.g. ``unknown-option-value``), fixing
+problems with score, fail-on, etc.
+
+Closes #9059

pylint/lint/pylinter.py

@@ -1071,7 +1071,6 @@ def _check_astroid_module(
 
     def open(self) -> None:
         """Initialize counters."""
-        self.stats = LinterStats()
         MANAGER.always_load_extensions = self.config.unsafe_load_any_extension
         MANAGER.max_inferable_values = self.config.limit_inference_results
         MANAGER.extension_package_whitelist.update(self.config.extension_pkg_allow_list)

tests/test_check_parallel.py

@@ -382,6 +382,7 @@ def test_sequential_checkers_work(self) -> None:
         # now run the regular mode of checking files and check that, in this proc, we
         # collect the right data
         filepath = [single_file_container[0][1]]  # get the filepath element
+        linter.stats = LinterStats()
         linter.check(filepath)
         assert {
             "input.similar1": {  # module is the only change from previous