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Usually out of memory failures looks like the workflow is working, working, working, working... until suddenly it just stops. There isn't any message in the stdout or stderr that says “completed successfully. starting delocalization.” Sometimes there aren’t even any error logs printed because there isn't enough memory to create them.
How to solve/test the problem
Increase memory in the runtime block for the failing task. You can bump it high to see if this is the issue, then lower to a reasonable amount later.