[Merge] Expense - LHN preview shows the original amount of merged expense when amount is different

[mitarachim]

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Version Number: 9.1.91-0
Reproducible in staging?: Yes
Reproducible in production?: N/A - new feature, doesn't exist in prod
If this was caught during regression testing, add the test name, ID and link from TestRail: #65596
Email or phone of affected tester (no customers): jsdknjsoisd@gmail.com
Issue reported by: Applause Internal Team
Device used: Mac 15.5 / Chrome
App Component: Money Requests

Action Performed:

1. Go to staging.new.expensify.com
2. Log in with new account.
3. Create two workspaces.
4. Submit an expense with different amount to each workspace.
5. Open the transaction thread from any expense.
6. Click More > Merge.
7. Select the other expense from another workspace.
8. Click Continue.
9. Select amount from the other expense.
10. Select any option for other fields.
11. Click Continue.
12. Click Merge expense.
13. Go back to LHN and reopen the merged expense.

Expected Result:

LHN preview will show "No activity yet".

Actual Result:

LHN preview shows the original amount of the merged expense instead of the new amount or "No activity yet".

Workaround:

Unknown

Platforms:

• Android: App
• Android: mWeb Chrome
• iOS: App
• iOS: mWeb Safari
• iOS: mWeb Chrome
• Windows: Chrome
• MacOS: Chrome / Safari
• MacOS: Desktop

Screenshots/Videos

Bug6911035_1754622880100.Screen_Recording_2025-08-08_at_11.11.08.mp4

View all open jobs on GitHub

[melvin-bot]

Triggered auto assignment to @jliexpensify (Bug), see https://stackoverflow.com/c/expensify/questions/14418 for more details. Please add this bug to a GH project, as outlined in the SO.

[melvin-bot]

Triggered auto assignment to @rlinoz (DeployBlockerCash), see https://stackoverflowteams.com/c/expensify/questions/9980/ for more details.

[melvin-bot]

💬 A slack conversation has been started in #expensify-open-source

[github-actions]

👋 Friendly reminder that deploy blockers are time-sensitive ⏱ issues! Check out the open `StagingDeployCash` deploy checklist to see the list of PRs included in this release, then work quickly to do one of the following:

1. Identify the pull request that introduced this issue and revert it.
2. Find someone who can quickly fix the issue.
3. Fix the issue yourself.

[dominictb]

This is a BE bug. OpenReport responds the last action with incorrect amount data.