Gravity Rush Remastered fails to launch after repacking psarc archive

[cobra838]

After repacking a PSARC archive, Gravity Rush Remastered fails to launch on shadPS4 v0.9.1. The same game works perfectly with the original archive. The archive was first extracted and then repacked with the same files without any modifications. UnPSARC shows no errors during both extraction and repacking processes.

• Game: Gravity Rush Remastered (CUSA01113)
• Archive: arc_0_ep_0_0.psarc

Also tested with another psarc tool (https://github.com/rm-NoobInCoding/UnPSARC/blob/master/Resources/psarc.exe)

psarc create --blocksize=65536 --inputfile=1.txt

Same issue occurs - game fails to start.

Alternative Tool TLOU_PSARC_Tool can successfully work with the same archive, but it:

• Does not preserve original folder and file names
• Extracts files without preserving folder structure (all files dumped to root)
• Repacks by importing files back into the original archive rather than creating new one

Only tested on emulator, not on real PS4 hardware.

Could you please investigate this issue?