A workflow triggered by updating a record and updating the same record leads to infinitely trigger that workflow

[StephanieJoly4]

Bug Description

I've built a workflow that is triggered by updating an opportunity.
Second step is a block of code to access some values / data points.
The final action is to update that record (this opportunity) using the values gathered at step 2.

It runs as expected in the sense that the values are updated. However, when looking at the logs of runs of that workflow, we saw a ton (vs one expected).

@thomtrp told me that something should have been added to prevent from creating such a loop. it does not seem to be working as expected hence why tagging as a bug.

Example:
Bug created on a customer's instance, let me know if you need to know which one

Expected behavior

The workflow runs once to prevent from billing customers unnecessarily (later).