JD3 w/ Silent file output crashing - Option filename not found

<Job nstruct="5">
     <Input>
          <PDB filename="pdb_basename.pdb" />
     </Input>
     <Output>
          <SilentFile path="pdb_basename" filename="pdb_basename_relaxed.silent"  />
     </Output>
     <SecondaryOutput>
          <ScoreFile path="pdb_basename" filename="score_pdb_basename.sc" />
     </SecondaryOutput>
     <Options>
          <parser__protocol value="path/to/RELAX_MONOMER_RS" />
     </Options>
</Job>

Apologies if this is the wrong category, couldn't quite determine which one this best fit into.

I'm using JD3 to run a protocol on multiple input PDBs (for now just FastRelax) and am trying to output all structures for a given input to a single silent file. However, whenever I try this with <Output> set to a silent file as above, Rosetta crashes & I get the following error (I've attached the full crash file as well):

[FILE]: src/utility/tag/Tag.hh
[LINE]: 182
[START_MESSAGE]
Option filename not found.

[END_MESSAGE]

When I replace the silent file with <PDB path="pdb_basename" filename_pattern="$_relaxed.pdb" /> the script runs as expected and outputs several relaxed PDBs in the folder pdb_basename; the issue just seems constrained to using SilentFiles, but I can't figure out the issue just based on the JD3 documentation (https://www.rosettacommons.org/docs/latest/RosettaScripts-JD3)

Thanks in advance for the help! Happy to provide more info as needed as well