diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,13 @@
 # Changelog
 
-## [0.12.0.0] - 2025-11-25
+## [0.12.2.0] - 2025-11-18
+
+### Changed
+
+* Fixed a bug in which parse errors would be ignored during checking as soon as
+  one missing capability was encountered.
+
+## [0.12.0.0] - 2025-11-15
 
 ### Added
 
diff --git a/opt-env-conf.cabal b/opt-env-conf.cabal
--- a/opt-env-conf.cabal
+++ b/opt-env-conf.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           opt-env-conf
-version:        0.12.1.0
+version:        0.12.2.0
 synopsis:       Settings parsing for Haskell: command-line arguments, environment variables, and configuration values.
 homepage:       https://github.com/NorfairKing/opt-env-conf#readme
 bug-reports:    https://github.com/NorfairKing/opt-env-conf/issues
diff --git a/src/OptEnvConf/Check.hs b/src/OptEnvConf/Check.hs
--- a/src/OptEnvConf/Check.hs
+++ b/src/OptEnvConf/Check.hs
@@ -6,13 +6,13 @@
 module OptEnvConf.Check
   ( runSettingsCheck,
     runSettingsCheckOn,
+    CheckResult (..),
   )
 where
 
 import qualified Data.Aeson as JSON
 import Data.List.NonEmpty (NonEmpty (..))
 import qualified Data.List.NonEmpty as NE
-import Data.Maybe
 import GHC.Generics (Generic)
 import GHC.Stack (SrcLoc)
 import OptEnvConf.Args as Args
@@ -80,13 +80,17 @@
   pure $ case errOrSets of
     Right a -> CheckSucceeded a
     Left errs ->
-      let missingCaps =
-            mapMaybe
+      -- If all the errors are missing capability errors, return
+      -- CheckIncapable, otherwise CheckFailed
+      let mMissingCaps =
+            -- This MUST be mapM instead of mapMaybe because we need to ensure
+            -- ALL errors are missing capability errors
+            mapM
               ( \case
                   ParseError mLoc (ParseErrorMissingCapability cap) -> Just (MissingCapability mLoc cap)
                   _ -> Nothing
               )
-              (NE.toList errs)
-       in case NE.nonEmpty missingCaps of
+              errs
+       in case mMissingCaps of
             Just ne -> CheckIncapable ne
             Nothing -> CheckFailed errs
diff --git a/src/OptEnvConf/Run.hs b/src/OptEnvConf/Run.hs
--- a/src/OptEnvConf/Run.hs
+++ b/src/OptEnvConf/Run.hs
@@ -215,7 +215,11 @@
           debug ["check"]
           -- Only perform the check (IO) if capabilities are sufficient
           ppIndent $ case missingCapabilities capabilities requiredCapabilities of
-            Just missings -> ppErrors mLoc $ NE.map ParseErrorMissingCapability missings
+            Just missings -> do
+              debug $
+                "Missing capabilities: "
+                  : capabilitiesChunks (Set.fromList (NE.toList missings))
+              ppErrors mLoc $ NE.map ParseErrorMissingCapability missings
             Nothing -> do
               errOrB <- liftIO $ f a
               case errOrB of