Same version of merge node behaves differently after n8n update

[Valdri]

Bug Description

Merge version 3 after n8n upgrade to 1.74.3 returns error if input is missing

This was not the case in version 1.68.1, where merging did not return an error, causing some of my workflows to start returning errors.

To Reproduce

In n8n 1.68.1, this workflow will NOT return an error:

In n8n 1.74.3, the same workflow WILL return an error:

Workflow file:
Merge_test__DEV_.json

Expected behavior

If merge logic has changed then it should be in new merge node version.

Operating System

Ubuntu

n8n Version

1.74.3

Node.js Version

Docker

Database

PostgreSQL

Execution mode

main (default)

[Joffcom]

Hey @Valdri,

We have created an internal ticket to look into this which we will be tracking as "N8N-8200"