IIS Shadow Copy - bug - The last numbered folder inside the Shadow Copy Directory is reused and keeps old artifacts

Hi,

I got many issues with shadow copy lately, mainly with old dlls not being deleted in the shadow copy folder and decided to analyse the source code.

I found this code chunk:

https://github.com/dotnet/aspnetcore/blob/1eda5387220d8c1ee5f3be433d867cae817df4ed/src/Servers/IIS/AspNetCoreModuleV2/AspNetCore/applicationinfo.cpp#L257-L337

It seems like it looks for the last existing numbered folder, but instead of incrementing the int value to create a new folder, it reuses the int value of the found folder.

I don't quite grasp the difference of responsibility between both those files :
https://github.com/dotnet/aspnetcore/blob/1eda5387220d8c1ee5f3be433d867cae817df4ed/src/Servers/IIS/AspNetCoreModuleV2/AspNetCore/applicationinfo.cpp
and
https://github.com/dotnet/aspnetcore/blob/main/src/Servers/IIS/AspNetCoreModuleV2/RequestHandlerLib/filewatcher.cpp

but in the later, where the shadow copy logic is replicated, the increment is done as expected :
https://github.com/dotnet/aspnetcore/blob/1eda5387220d8c1ee5f3be433d867cae817df4ed/src/Servers/IIS/AspNetCoreModuleV2/RequestHandlerLib/filewatcher.cpp#L397

Can you explain the difference between both the logics, and is what I spotted actually a bug ?