After a few days of hard work, I am writing that I have succeeded in fixing this.
As I expected in the article, the problem with the sysmodule at the system partition was correct.
Following the “nsw unbrick guide level 1” of some other youtuber starting with the “s”, I replaced the HOS of sysnand with a file made from the “emmchaccgen” program, which made it work perfectly.
I think this is the first time I’ve seen a sysmodule that is a component of HOS being destroyed. There was no problem right after the update to version 16.0.3, but I think there was a problem after the initialization, so I think there was a problem during the initialization process, but I still have no idea why.
Anyway, I’ve now updated it to the latest version, 17.0.1, after which everything works fine even after further initialization. Thank you all so much. 