The same mnemonic generates two addresses on the test network: tb1pfscdjh8dkqy98gp0xkudrkx88zwslsvd32z60d9nhpm343rewsmqf55g7q and tb1q84jq2rq4jdf8nauum7haneseaqmg89zj944x5k.
It's easy to receive test coins at tb1q84jq2rq4jdf8nauum7haneseaqmg89zj944x5k, but tb1pfscdjh8dkqy98gp0xkudrkx88zwslsvd32z60d9nhpm343rewsmqf55g7q cannot receive them.
Why is this?
How can I obtain Bitcoin test coins?