Error 404 when updating from 9.3.1 to 9.4.0 Developer Edition

[tisonv]

This issue is unique.

• I have used the search tool and did not find an issue describing my bug.

Operating System of DocumentServer

Windows Server

Version information

9.4.0.129

Expected Behavior

It should work

Actual Behavior

In D:\XXXX\DocumentServer\web-apps\apps\documenteditor\main a index_loader.html is expected but is not present :

The issue ressembles #2933
Emptying caches does nothing.

The file is not present in the directory.

Reproduction Steps

Install 9.4.0.129

Additional information

No response

[my1127angel]

I encountered this issue as well, which occurred after I added the loaderLogo or LoaderName configuration options

[avdddd1111]

Hello @tisonv @my1127angel

I've reproduced this issue and registered it as #81731.
Workaround: If you control the editor configuration, removing customization.toolbarNoTabs: true (or loaderLogo/loaderName) will prevent the redirect to the missing file.

Thanks!