diff --git a/src/modules/config.js b/src/modules/config.js
index e6b373b440..7997521daf 100644
--- a/src/modules/config.js
+++ b/src/modules/config.js
@@ -102,6 +102,7 @@ const config = {
           setPreset(value)
           break
         case 'customTheme':
+        case 'customThemeSource':
           applyTheme(value)
       }
     }
diff --git a/src/services/theme_data/theme_data.service.js b/src/services/theme_data/theme_data.service.js
index e6ff82e61a..de6561cd7f 100644
--- a/src/services/theme_data/theme_data.service.js
+++ b/src/services/theme_data/theme_data.service.js
@@ -352,7 +352,8 @@ export const getColors = (sourceColors, sourceOpacity) => SLOT_ORDERED.reduce(({
   }
   const opacitySlot = getOpacitySlot(key)
   const ownOpacitySlot = value.opacity
-  if (opacitySlot && (outputColor.a === undefined || ownOpacitySlot)) {
+  const opacityOverriden = ownOpacitySlot && sourceOpacity[opacitySlot] !== undefined
+  if (opacitySlot && (outputColor.a === undefined || opacityOverriden)) {
     const dependencySlot = deps[0]
     if (dependencySlot && colors[dependencySlot] === 'transparent') {
       outputColor.a = 0