test_group_range_construct_2_proc_4 failing in CI

[lifflander]

Describe the bug

[ RUN      ] TestGroup.test_group_range_construct_2
vt: Runtime Initializing: interop=true: mode: single-thread per rank
vt: Program: group_basic (./group_basic)
vt: Running on: 4 nodes
vt: Machine Hostname: ef2444f4393b
vt: MPI Version: 3.1
vt: MPI Max tag: 2147483647
vt: Build SHA: 8d7015d35965afc644e669c2608d015d36f97ddf
vt: Build Ref: 
vt: Description: remotes/pull/1579/merge-0-g8d7015d359 
vt: Compile-time Features Enabled:
vt: 	Message priorities
vt: 	Memory Pooling
vt: 	MPI access guards
vt: 	Performance analysis diagnostics
vt: Runtime Configuration:
vt: 	Option: flag --vt_sched_num_progress on: Running MPI progress 2 times each invocation
vt: 	Option: flag --vt_sched_progress_han on: Running MPI progress function at least every 0 handler(s) executed
vt: 	Option: flag --vt_print_no_progress on: Printing warnings when progress is stalls
vt: 	Default: Printing verbose epoch graphs when hang detected, use --vt_epoch_graph_terse to disable
vt: 	Option: flag --vt_epoch_graph_on_hang on: Epoch graph output enabled if hang detected
vt: 	Default: Termination hang detection enabled by default, use --vt_no_detect_hang to disable
vt: 	Option: flag --vt_hang_detect on: Printing stall warning every 1024 tree traversals 
vt: 	Default: SIGINT signal handling enabled by default, use --vt_no_SIGINT to disable
vt: 	Default: SIGSEGV signal handling enabled by default, use --vt_no_SIGSEGV to disable
vt: 	Default: SIGBUS signal handling enabled by default, use --vt_no_SIGBUS to disable
vt: 	Default: std::terminate signal handling enabled by default, use --vt_no_terminate to disable
vt: 	Option: flag --vt_no_color on: Color output disabled
vt: 	Default: Stack dumps enabled by default, use --vt_no_stack to disable
vt: 	Option: flag --vt_memory_reporters on: Memory usage checker precedence: mstats,machinfo,selfstat,selfstatm,sbrk,mallinfo,getrusage,ps
vt: 	Working memory reporters: selfstatm,mallinfo,getrusage
vt: 	Initial memory usage: selfstatm=15.6172 mallinfo=1.5771 getrusage=15.6172 (MiB)
vt: 	Default: Memory usage printing disabled, use --vt_print_memory_each_phase to enable
vt: 	Default: Diagnostics are disabled by default, use --vt_diag_enable to enable
vt: 	Option: flag --vt_max_mpi_send_size on: Splitting messages greater than 1 GiB
vt: 	Option: flag --vt_debug_level on: Debug print mode set to terse
vt: Pass-through Arguments:
vt: 	None. All arguments handled.
Group is created: group=2
3: groupHandler: num_recv=1
/vt/tests/unit/group/test_group.cc:128: Failure
Expected equality of these values:
  num_recv
    Which is: 0
  1
1: groupHandler: num_recv=1
2: groupHandler: num_recv=1
vt: Total collective epochs processed: 1
vt: Total work units processed: 66
vt: Runtime Finalizing

[lifflander]

I reproduced this with 75 tries on develop with this command /vt/scripts/run-repeat.sh ./tests/group_basic 4