Crash with "Un-drifted gparts" in SmallCosmoVolume_cooling -- Extra gpart are not escaped in many code functions

The SmallCosmoVolume_cooling example seems to have a chance of crashing when run with a certain configuration. If I build Swift (commit 062b620d from master) with

module purge
module load intel_comp/2018 intel_mpi/2018 fftw/3.3.7
module load parallel_hdf5/1.10.3 parmetis/4.0.3
module load gsl/2.4 Healpix/3.40

cd .. && ./autogen.sh && cd -
../configure \
    --disable-ipo \
    --enable-debug \
    --enable-optimization \
    --with-hdf5 \
    --with-fftw \
    --with-parmetis \
    --with-subgrid=EAGLE

and then run Swift like this using the parameters from examples/SmallCosmoVolume/SmallCosmoVolume_cooling:

./swiftsim/build/examples/swift --verbose=1 \
    --self-gravity --cosmology --hydro --cooling \
    --pin --threads=28 \
    ./small_cosmo_volume.yml

then it sometimes reaches z=0 successfully, but occasionally it crashes with a message like this:

...
[00542.1] engine_unskip: took 71.350 ms.
[00542.1] engine_prepare: Communicating rebuild flag took 0.001 ms.
[00542.1] engine_prepare: took 71.355 ms (including unskip, rebuild and reweight).
[00542.2] ../../src/runner_doiact_grav.c:runner_doself_grav_pp():1742: Un-drifted gparts
Command terminated by signal 6

Maybe this is just not a very sensible configuration - compiling with the full EAGLE model then only using hydro and cooling at runtime?