加载与引用.NET DLL相同的文件夹中的引用的.NET DLL时出现“未找到”异常

我有一个带有多个可见COM类的.NET DLL SigToolNet.DLL。它为本机C ++静态库FTDIVCPLIB引用了.NET DLL FTDIVcpLibNet.DLL包装器，该库又引用了第三方本机DLL ftd2xx.dll。SigToolNet.DLL已成功注册到32位regasm

C:\Release> regasm SigToolNet.dll /codebase
RegAsm : warning RA0000 : Registering an unsigned assembly with /codebase can cause your assembly to interfere with other applications that may be installed on the same computer. The /codebase switch is intended to be used only with signed assemblies. Please give your assembly a strong name and re-register it.
Types registered successfully

旁注，由于SigToolNet.dll是经过代码签名的，因此我不知道为什么会发出此警告。在安装了VS2019的开发系统上运行时，引用SigToolNet.DLL中COM可见类的应用程序TestHarness.exe成功运行。但是，当SigToolNet.DLL安装在另一台计算机上时，在运行时出现异常，在该时刻调用了对COM可见方法之一（DetectDevice）的第二次调用

Command DetectDevice failed
Error code: -2147024770
Desc: Could not load file or assembly 'FTDIVcpLibNet.dll' or one of its dependencies. The specified module could not be found.

包括FTDIVcpLibNet.dll在内的所有引用DLL都位于SigToolNet.DLL所在的同一文件夹中，该文件夹也是其注册地。

我尝试在3台不同的计算机上运行，​​但在Windows 7和Windows 10上均出现相同的失败结果。成功运行的开发系统正在运行Windows 10。

我还尝试使用Assembly Binding Log Viewer（fuslogvw.exe）跟踪程序集加载失败。

*** Assembly Binder Log Entry  (6/26/2020 @ 4:00:00 PM) ***

The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.

Assembly manager loaded from:  C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll
Running under executable  C:\Vendor Testing Harness\Epic 2018 And Beyond\EpicESigTestHarness.exe
--- A detailed error log follows. 

=== Pre-bind state information ===
LOG: DisplayName = SigToolNet, Version=2020.0.0.3, Culture=neutral, PublicKeyToken=null
 (Fully-specified)
LOG: Appbase = file:///C:/Vendor Testing Harness/Epic 2018 And Beyond/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = EpicESigTestHarness.exe
Calling assembly : (Unknown).
===
LOG: This bind starts in the default load context.
LOG: Download of the application configuration file was attempted from file:///C:/Vendor Testing Harness/Epic 2018 And Beyond/EpicESigTestHarness.exe.config.
LOG: Configuration file C:\Vendor Testing Harness\Epic 2018 And Beyond\EpicESigTestHarness.exe.config does not exist.
LOG: No application configuration file found.
LOG: Using host configuration file: 
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///C:/Vendor Testing Harness/Epic 2018 And Beyond/SigToolNet.DLL.
LOG: Attempting download of new URL file:///C:/Vendor Testing Harness/Epic 2018 And Beyond/SigToolNet/SigToolNet.DLL.
LOG: Attempting download of new URL file:///C:/Vendor Testing Harness/Epic 2018 And Beyond/SigToolNet.EXE.
LOG: Attempting download of new URL file:///C:/Vendor Testing Harness/Epic 2018 And Beyond/SigToolNet/SigToolNet.EXE.
LOG: All probing URLs attempted and failed.

我发现此日志令人困惑。它说无法找到SigToolNet.dll，但似乎在与TestHarness.exe相同的文件夹中寻找它。它应该在C：\ Release中寻找它，这是SigToolNet.dll成功注册的地方。此外，报告的异常不是不是找不到SigToolNet.dll，而是不是找不到FTDIVcpLibNet.dll。它看起来的第一个位置不应该与SigToolNet.dll的注册文件夹相同吗？

我在VS2019中使用了远程调试，并且能够在调用第一个方法Init时在SigToolNet中实现断点和单步执行。但是由于执行调用之前的异常，对DetectDevice的第二次调用的断点永远不会发生。

所有.NET DLL都使用.NET 4.8

我无法确定为什么它可以在开发了SigToolNet.dll并安装了VS2019的系统上成功运行，但不能在其他系统上成功运行。