Continuing from extended simulation fails to find output files

GROMACS version: 2019.6
GROMACS modification: No

Dear all,

I have extended my simulation with the following instruction:

  1. gmx convert-tpr -s md_0_1.tpr -extend 50000 -o md_1_2.tpr
  2. gmx mdrun -deffnm md_1_2 -cpi md_0_1.cpt -noappend

It generated a bunch of .part0009 files (edr, trr etc etc)

Now, because the machine is not run 24/7, I have tried to stop and continue with the following command:

gmx mdrun -deffnm md_1_2 -s md_1_2.tpr -cpi md_1_2.cpt -append

Which throws the following error:

Output file appending has been requested,
but some output files listed in the checkpoint file md_1_2.cpt
are not present or not named as the output files by the current program:
Expect output files present:

Expected output files not present or named differently:
md_1_2.part0009.log
md_1_2.part0009.xtc
md_1_2.part0009.trr
md_1_2.part0009.edr

The files are indeed present in the directory, can anyone help out?

I have tried renaming the part0009 files to just md_1_2 to match -deffnm but still throws an error.

Thanks in advance for the help.