diff --git a/src/layouts/scheduling/scheduling.vue b/src/layouts/scheduling/scheduling.vue
index 7cca53596..b889826c8 100644
--- a/src/layouts/scheduling/scheduling.vue
+++ b/src/layouts/scheduling/scheduling.vue
@@ -88,6 +88,20 @@ function toDateString(offsetDays, base = new Date()) {
 const SCHEDULE_FETCH_DAYS = 15;
 const SCHEDULING_RADIO_GROUP_NAME = "schedulingTimeSlot";
 
+/**
+ * Appends days from newSlots into entry.timeSlots, initializing it if absent.
+ * @param {{ timeSlots: { days: any[] } | null }} entry
+ * @param {{ days: any[] } | null | undefined} newSlots
+ */
+function appendDays(entry, newSlots) {
+    if (!newSlots) return;
+    if (!entry.timeSlots) {
+        entry.timeSlots = newSlots;
+    } else {
+        entry.timeSlots.days = [...(entry.timeSlots.days ?? []), ...(newSlots.days ?? [])];
+    }
+}
+
 /**
  * Returns a promise for inshop time slots for a single provider.
  * @param {{ startDate: string, endDate: string, providerNumber: string, pageNameToLog: string }} params
@@ -326,29 +340,13 @@ export default {
 
             const resultMap = await settleAllPromises(promiseResultMap);
 
+            // Provider order is fixed after beforeRouteEnter, so index keys are stable.
             this.inShopProvidersAndTimeslots.forEach((entry, index) => {
-                const newSlots = resultMap[`inshopTimeSlots_${index}`];
-                if (!newSlots) return;
-                if (!entry.timeSlots) {
-                    entry.timeSlots = newSlots;
-                } else {
-                    entry.timeSlots.days = [
-                        ...(entry.timeSlots.days ?? []),
-                        ...(newSlots.days ?? []),
-                    ];
-                }
+                appendDays(entry, resultMap[`inshopTimeSlots_${index}`]);
             });
 
-            if (this.mobileProviderAndTimeSlot && resultMap.mobileTimeSlots) {
-                const newSlots = resultMap.mobileTimeSlots;
-                if (!this.mobileProviderAndTimeSlot.timeSlots) {
-                    this.mobileProviderAndTimeSlot.timeSlots = newSlots;
-                } else {
-                    this.mobileProviderAndTimeSlot.timeSlots.days = [
-                        ...(this.mobileProviderAndTimeSlot.timeSlots.days ?? []),
-                        ...(newSlots.days ?? []),
-                    ];
-                }
+            if (this.mobileProviderAndTimeSlot) {
+                appendDays(this.mobileProviderAndTimeSlot, resultMap.mobileTimeSlots);
             }
 
             this.datePickerEndDate = newEndDate;