diff --git a/src/fields/hooks/beforeChange/promise.ts b/src/fields/hooks/beforeChange/promise.ts
index 5d7185b4f3..58fdb66731 100644
--- a/src/fields/hooks/beforeChange/promise.ts
+++ b/src/fields/hooks/beforeChange/promise.ts
@@ -3,10 +3,8 @@ import merge from 'deepmerge';
 import { Field, fieldAffectsData, TabAsField, tabHasName } from '../../config/types';
 import { Operation } from '../../../types';
 import { PayloadRequest, RequestContext } from '../../../express/types';
-import getValueWithDefault from '../../getDefaultValue';
 import { traverseFields } from './traverseFields';
 import { getExistingRowDoc } from './getExistingRowDoc';
-import { cloneDataFromOriginalDoc } from './cloneDataFromOriginalDoc';
 
 type Args = {
   data: Record<string, unknown>
@@ -28,8 +26,6 @@ type Args = {
 
 // This function is responsible for the following actions, in order:
 // - Run condition
-// - Merge original document data into incoming data
-// - Compute default values for undefined fields
 // - Execute field hooks
 // - Validate data
 // - Transform data for storage
@@ -59,26 +55,6 @@ export const promise = async ({
   const operationLocale = req.locale || defaultLocale;
 
   if (fieldAffectsData(field)) {
-    if (typeof siblingData[field.name] === 'undefined') {
-      // If no incoming data, but existing document data is found, merge it in
-      if (typeof siblingDoc[field.name] !== 'undefined') {
-        if (field.localized && typeof siblingDocWithLocales[field.name] === 'object' && siblingDocWithLocales[field.name] !== null) {
-          siblingData[field.name] = cloneDataFromOriginalDoc(siblingDocWithLocales[field.name][req.locale]);
-        } else {
-          siblingData[field.name] = cloneDataFromOriginalDoc(siblingDoc[field.name]);
-        }
-
-        // Otherwise compute default value
-      } else if (typeof field.defaultValue !== 'undefined') {
-        siblingData[field.name] = await getValueWithDefault({
-          value: siblingData[field.name],
-          defaultValue: field.defaultValue,
-          locale: req.locale,
-          user: req.user,
-        });
-      }
-    }
-
     // skip validation if the field is localized and the incoming data is null
     if (field.localized && operationLocale !== defaultLocale) {
       if (['array', 'blocks'].includes(field.type) && siblingData[field.name] === null) {
diff --git a/src/fields/hooks/beforeValidate/promise.ts b/src/fields/hooks/beforeValidate/promise.ts
index 5d6e0aa8bd..5f206dc3fc 100644
--- a/src/fields/hooks/beforeValidate/promise.ts
+++ b/src/fields/hooks/beforeValidate/promise.ts
@@ -1,6 +1,9 @@
 /* eslint-disable no-param-reassign */
 import { PayloadRequest, RequestContext } from '../../../express/types';
 import { Field, fieldAffectsData, TabAsField, tabHasName, valueIsValueWithRelation } from '../../config/types';
+import getValueWithDefault from '../../getDefaultValue';
+import { cloneDataFromOriginalDoc } from '../beforeChange/cloneDataFromOriginalDoc';
+import { getExistingRowDoc } from '../beforeChange/getExistingRowDoc';
 import { traverseFields } from './traverseFields';
 
 type Args<T> = {
@@ -20,6 +23,8 @@ type Args<T> = {
 // - Sanitize incoming data
 // - Execute field hooks
 // - Execute field access control
+// - Merge original document data into incoming data
+// - Compute default values for undefined fields
 
 export const promise = async <T>({
   data,
@@ -189,6 +194,22 @@ export const promise = async <T>({
         delete siblingData[field.name];
       }
     }
+
+    if (typeof siblingData[field.name] === 'undefined') {
+      // If no incoming data, but existing document data is found, merge it in
+      if (typeof siblingDoc[field.name] !== 'undefined') {
+        siblingData[field.name] = cloneDataFromOriginalDoc(siblingDoc[field.name]);
+
+        // Otherwise compute default value
+      } else if (typeof field.defaultValue !== 'undefined') {
+        siblingData[field.name] = await getValueWithDefault({
+          value: siblingData[field.name],
+          defaultValue: field.defaultValue,
+          locale: req.locale,
+          user: req.user,
+        });
+      }
+    }
   }
 
   // Traverse subfields
@@ -231,7 +252,7 @@ export const promise = async <T>({
             overrideAccess,
             req,
             siblingData: row,
-            siblingDoc: siblingDoc[field.name]?.[i] || {},
+            siblingDoc: getExistingRowDoc(row, siblingDoc[field.name]),
             context,
           }));
         });
@@ -258,7 +279,7 @@ export const promise = async <T>({
               overrideAccess,
               req,
               siblingData: row,
-              siblingDoc: siblingDoc[field.name]?.[i] || {},
+              siblingDoc: getExistingRowDoc(row, siblingDoc[field.name]),
               context,
             }));
           }
@@ -291,8 +312,11 @@ export const promise = async <T>({
       let tabSiblingData;
       let tabSiblingDoc;
       if (tabHasName(field)) {
-        tabSiblingData = typeof siblingData[field.name] === 'object' ? siblingData[field.name] : {};
-        tabSiblingDoc = typeof siblingDoc[field.name] === 'object' ? siblingDoc[field.name] : {};
+        if (typeof siblingData[field.name] !== 'object') siblingData[field.name] = {};
+        if (typeof siblingDoc[field.name] !== 'object') siblingDoc[field.name] = {};
+
+        tabSiblingData = siblingData[field.name] as Record<string, unknown>;
+        tabSiblingDoc = siblingDoc[field.name] as Record<string, unknown>;
       } else {
         tabSiblingData = siblingData;
         tabSiblingDoc = siblingDoc;
diff --git a/test/fields/collections/Text/index.ts b/test/fields/collections/Text/index.ts
index 56a7220ebd..fd92475e38 100644
--- a/test/fields/collections/Text/index.ts
+++ b/test/fields/collections/Text/index.ts
@@ -57,6 +57,26 @@ const TextFields: CollectionConfig = {
       type: 'text',
       maxLength: 50000,
     },
+    {
+      name: 'fieldWithDefaultValue',
+      type: 'text',
+      defaultValue: async () => {
+        const defaultValue = new Promise((resolve) => setTimeout(() => resolve('some-value'), 1000));
+
+        return defaultValue;
+      },
+    },
+    {
+      name: 'dependentOnFieldWithDefaultValue',
+      type: 'text',
+      hooks: {
+        beforeChange: [
+          ({ data }) => {
+            return data?.fieldWithDefaultValue || '';
+          },
+        ],
+      },
+    },
   ],
 };
 
diff --git a/test/fields/int.spec.ts b/test/fields/int.spec.ts
index 5cc287230d..2266f560f8 100644
--- a/test/fields/int.spec.ts
+++ b/test/fields/int.spec.ts
@@ -47,6 +47,15 @@ describe('Fields', () => {
       expect(doc.defaultFunction).toEqual(defaultText);
       expect(doc.defaultAsync).toEqual(defaultText);
     });
+
+    it('should populate default values in beforeValidate hook', async () => {
+      const { fieldWithDefaultValue, dependentOnFieldWithDefaultValue } = await payload.create({
+        collection: 'text-fields',
+        data: { text },
+      });
+
+      await expect(fieldWithDefaultValue).toEqual(dependentOnFieldWithDefaultValue);
+    });
   });
 
   describe('timestamps', () => {