This is often caused by a firmware mismatch. Ensure you have installed a backport fix if your console is on an older firmware version.
While the remaster is naturally stable, some custom fixes enable specific features like debug settings or infinite health glitches similar to the original PS3 version. Common Issues and How to Fix Them God Of War 3 Remastered Ps4 Pkg Fix
If your PKG is not working as expected, try these troubleshooting steps: This is often caused by a firmware mismatch
PS4 Auto Pkg Install Tutorial | Installing Pkg's Without Debug Settings God Of War 3 Remastered Ps4 Pkg Fix