Some SMILE lead to a very large 3D structure (separate each conformer)

[saurabh2804]

OC(=O)CNC(=O)C1CCCN1 L-Prolylglycine

This formed a multi-conformer sdf "L-Prolylglycine__input2881.sdf" (within the zipped file). Converted it to pdbqt with obabel. I used two flags: -m and -writeconformers
obabel -isdf input.sdf -O drug.pdbqt --writeconformers -m
It wrote a really large 3D PDBQT. Making directly in obabel from SMILE gives a normal molecule.
This is the same for several molecules
Please suggest changes to the process to avoid this issue
L-proglycine.zip

Thank you,
Regards

EDIT: On ubuntu 24.04 and the latest version of Gypsum_DL