Thanks to forum user @leatherneck6017 for this:

linuxgurugamer · linuxgurugamer · commit 937ecdb55224 · 2020-03-04T19:43:27.000-05:00
Add custom check for parts that have TechHidden = True
diff --git a/ChangeLog.txt b/ChangeLog.txt
@@ -161,3 +161,7 @@ Changelog
 		Update SubCategories_Electrical.cfg (KSP-IE quick fix)
 		Tantares fix
 		Update SubCategories_Electrical.cfg
+
+3.2.4.2
+	Thanks to forum user @leatherneck6017 for this:
+		Add custom check for parts that have TechHidden = True
diff --git a/FilterExtension.version b/FilterExtension.version
@@ -10,7 +10,7 @@
     "MAJOR": 3,
     "MINOR": 2,
     "PATCH": 4,
-    "BUILD": 1
+    "BUILD": 2
   },
   "KSP_VERSION_MIN": {
     "MAJOR": 1,
