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I expect this is somehow related to the Download Tool in combination with the Dynamic Input in this older version causing this issue. The Dynamic Input tries to read the file while it is still downloading.
This is how I solved it
Simply add a "Block Until Done" in front of the Download Tool and then everything should be OK. Please keep AMP enabled ... for some reason it tends to fail when disabling it.
BTW: 2020.4 is already out of support. Please take into consideration to upgrade your server environment.