Trello: Webhook updateCard Returning Incorrect old.idLabels Data

[reactjs_developer]

Board ID: 67470ced0061d56e33f4dce2
Action Type: updateCard
Action Display: unknown

We are experiencing an issue with the Trello webhook for the board listed above. During an updateCard action, the webhook is returning incorrect data — specifically in the old.idLabels field.

The old.idLabels is expected to contain only the label(s) that were removed or changed, but instead, it is returning the full list of current labels, making the "old" and "new" values identical. This prevents us from accurately detecting changes to labels on a card and is causing inconsistent behavior in our application’s tag selection logic.

Here’s a summary of the webhook payload:

• New Labels (card.idLabels):
  ["67470cee0061d56e33f4e4f0", "67470cee0061d56e33f4e4f4"]

• Old Labels (old.idLabels):
  ["67470cee0061d56e33f4e4f0", "67470cee0061d56e33f4e4f4"] (expected only one label here)

This appears to be a recent issue — webhook payloads were working as expected previously.

Please investigate this behavior or let us know if there are any updates or changes in how updateCard webhooks should be handled. We're also open to exploring alternative solutions if recommended.

Thank you.

[Mike - Dreamsuite Consulting]

Hi @reactjs_developer 

It may be worth posting here, if you haven't already:

https://community.developer.atlassian.com/c/trello/42 

[reactjs_developer]

Thanks @Mike - Dreamsuite Consulting just posted on the shared link as well.

[Sakshi Verma]

Thank you for routing this to the Developer Community. Feel free to let me know if you don't receive any response there from one of the developers.

Thank you!