Fix issue preventing plugins to work with flavors (#2532)

Fixes #2530

Author: nvuillam

CHANGELOG.md

@@ -18,6 +18,7 @@ Note: Can be used with `oxsecurity/megalinter@beta` in your GitHub Action mega-l
     [#2455](https://github.com/oxsecurity/megalinter/pull/2455).
 
 - Core
+  - Fix issue preventing plugins to work with flavors
 
 - Documentation
 

megalinter/flavor_factory.py

@@ -83,7 +83,9 @@ def check_active_linters_match_flavor(active_linters):
     flavor_linters = all_flavors[flavor]["linters"]
     missing_linters = []
     for active_linter in active_linters:
-        if active_linter.name not in flavor_linters:
+        if (
+            active_linter.name not in flavor_linters
+        ) and active_linter.is_plugin is False:
             missing_linters += [active_linter.name]
             active_linter.is_active = False
     # Manage cases where linters are missing in flavor