write_transient_residuals fails in reacting flow

[uqngibbo]

mpirun -np 4 lmr-mpi-run                                                                       
Eilmer simulation code.                                                                        
Revision-id: e38e9533                                                                          
Revision-date: Thu Jun 5 14:15:55 2025 +1000                                                   
Compiler-name: ldc2                                                                            
Parallel-flavour: OpenMPI                                                                      
Number-type: real                                                                              
Build-flavour: debug                                                                           
Build-date: Thu Jun  5 02:56:43 PM AEST 2025                                                   
Heap memory used: 47 MB, unused: 41 MB, total: 88 MB (22-22 MB per task)                       
Step=     20 t= 2.500e-08 dt= 1.500e-09 cfl=0.04 WC=0.2 WCtFT=432.4 WCtMS=95499.8              
core.exception.ArrayIndexError@./timemarching.d(555): index [999999] is out of bounds for array of length 8                                                                                   
----------------                                                                               
??:? onArrayIndexError [0x5913d861732d]                                                                                                                                                       
??:? _d_arraybounds_index [0x5913d86179dd]                                                     
./timemarching.d:553 int lmr.timemarching.integrateInTime(double) [0x5913d817c643]             
runsim_mpi.d:355 _Dmain [0x5913d8314b6d]