The output is cached, so maybe it didn't work because of that. The setting External Data Provider > Thread Cache Lifespan controls how long things are cached, but I don't know if you can turn it off by using 0 (the instructions don't mention it). You could either set it to 1 minute and wait between tests, or figure out where in the database it's stored and truncate the table between tests.
ETA: I guess it's the "externalcache" table.
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