Css dosnt work in some pc

I have two pc named A and B
I download the release code from  version 4.60.4
On the two pc, i do the same work：
1. compile code in debug mode，then press F5 to start the application
2.install,connect to the database
3. restart the application
The Css In homepage/Admin area  work fine in PC A and no work in PC B

Press F12 ,PC B shows errors in DevTools.Like this：

Refused to apply style from 'https://localhost:44369/css/b5-kl4t2pzo-cdvyvxfjkw.styles.css?v=mB-X3JvQLhn2O98pRKsKTqfdIyE' because its MIME type ('text/plain') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

I once wrote a post describing this problem

https://www.nopcommerce.com/zh/boards/topic/94990/when-first-run-the-web-in-debug-modethe-css-dosnt-work

I also install the app  with  nopCommerce_4.60.4_NoSource_win_x64 ON PC B, The css dosnt work too.

By th way , I use nopCommerce_4.40 code for test,The css dosnt work  On PC B.

On the forum, I saw someone who had the same problem as me.

My .net sdk version  both in PC A and PC B  are  7.0.400

Check on the Network tab of the browser developer tool (F12).  Are you getting a 404 error?
Check your appsettings.json file.  Is the "CacheDirectory" a valid / existing path?

New York wrote:

No 404 error，the css is existd in my local path.
In my appsettings.json，the settingconfig what u say is

"CacheDirectory": null,

Both code on Pc A and B   is downloaded from the github，and they are absolutely same.
So I don't think it was the configuration that caused the problem.

Any other suggestions?   Thanks