Datastore importing and exporting entities: should export, then import entities failed

[flaky-bot[bot]]

Note: #1122 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

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commit: fb82e1c8bbaf5834448166d4e52737bc4203cb0f buildURL: Build Status, Sponge status: failed

[flaky-bot[bot]]

Looks like this issue is flaky. :worried:

I'm going to leave this open and stop commenting.

A human should fix and close this.

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When run at the same commit (fb82e1c8bbaf5834448166d4e52737bc4203cb0f), this test passed in one build (Build Status, Sponge) and failed in another build (Build Status, Sponge).