Bug(?): Step fails in individual testing, but works when entire flow is run

When testing each step in the flow, (which is required so that I can use the output of this loop as a payload to pass to a child flow), this step fails:


However, this step works fine when the entire run is tested or triggered:

Also this error only started to exist randomly after some updates occurred, this flow was working perfectly fine beforehand.

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Hey there, could you please make sure your previous step test exists ? we remove sample data every 30 days.

Yes the previous step certainly does exist