diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4337ee6ff3e..e5d0c24e021 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## Version 24.05.XX
 Enterprise fixes:
 - [nps] Fixed bug in the editor where the "internal name" field was not mandatory
+- [data-manager] Fixed UI bug where rules were not visible when editing "Merge by regex" transformations
 
 ## Version 24.05.16
 Fixes:
diff --git a/plugins/data-manager/frontend/public/javascripts/countly.views.js b/plugins/data-manager/frontend/public/javascripts/countly.views.js
index fff2cd5f1c3..ef5f22390e2 100644
--- a/plugins/data-manager/frontend/public/javascripts/countly.views.js
+++ b/plugins/data-manager/frontend/public/javascripts/countly.views.js
@@ -1131,11 +1131,12 @@
                 }
                 if (doc.actionType === 'EVENT_MERGE' && doc.isRegexMerge === true) {
                     doc.actionType = 'merge-regex';
+                    doc.eventTransformTargetRegex = doc.transformTarget[0];
                 }
                 else {
                     doc.actionType = doc.actionType.split('_')[1].toLowerCase();
                 }
-                doc.isExistingEvent = 'true';
+                doc.isExistingEvent = doc.isExistingEvent ? 'true' : 'false';
                 // doc.tab;
                 // delete doc.transformType;
                 doc.name = countlyCommon.unescapeHtml(doc.name);