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Starting from the 13w16a snapshot, Minecraft stopped bundling all its resource files directly into the client.jar file. Instead, less critical or particularly large resources are now stored on Mojang's asset server. The game downloads these files on-demand when it starts up.
Because the files are stored according to their hash values, they're commonly called "hashed assets".
However, the game still needs to find these files using their original resource paths (like minecraft:sounds/block/stone/place.ogg). To bridge this gap, each game version has a special resource index file. This file acts like a map, letting the game look up the correct hash value for any given resource path. ---散列资源文件 - 中文 Minecraft Wiki

This is probably where the problem is. @JYN2018X

Because this file has not been enabled, there is nothing in the corresponding directory. I have scrapped a system to decompress this.

But there is nothing.

I have source files for both third-party and official clients. But it seems that it is not that simple.

That is, in order to keep the size of the client, the government will not put anything except those core files (including. lang files) in a server, and when the game is started, it will automatically start downloading and enabling. I feel that something is wrong here.

look this

https://report.bugs.mojang.com/browse/MC-310736

At present, many people have reported this error.

Looks like the hashed resource files didn't download properly in snapshot 26.3. I've tried both third-party launchers and the official client, and it's the same issue everywhere.