pt-table-checksum + PXC inconsistent results upon --resume

If I interrupt and then resume a pt-table-checksum checking two PXC nodes, ~20-30% of times I get an incorrect result - checksum mismatch. This is easily reproducible with small tables. Here's the command I am running:

/usr/bin/pt-table-checksum \
                        --recursion-method cluster \
                        --user $USER \
                        --password $PASSWORD \
                        --max-load Threads_running=$MAXTHREADS \
                        --progress time,3600 \
                        --chunk-size-limit 4 \
                        --pid $PID \
                        --databases db1,db2"

PTDEBUG output, as it containts sensitive customer information, will be sent privately.

Daniel's hack that adds an extra 1.5s delay before checking for the last chunk, decreased this effect to zero, but we were testing with very small tables, so such waits added a lot of overhead and I am guessing in most cases I would interrupt pt-table-checksum while it was waiting.

Tested with pt-table-checksum 2.2.7 and Percona XtraDB Cluster, Release 31.1, wsrep_25.9.r3928 (5.5.34-31.1)