Un-drifted gparts in 3D Evrard collapse test

I have added a new EvrardCollapse_3D test (using magical scheduler values that seem to work, see #382 (closed)), and I'm running into the following problem:

[00477.3] runner_doiact_grav.h:runner_dopair_grav_pp():445: Un-drifted gparts

This problem can be reproduced by running the new test (in the evrard branch). Am I doing something wrong, or is this a bug?

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