I haven’t noticed this behaviour in my environment, and our users are indeed saving to OneDrive!

I was trying to do exact same thing with NGINX PROXY MANAGER.

for the record, the proxy_pass settings for NPM for anyone in need goes like this:

proxy_redirect off;
proxy_http_version 1.1;
proxy_request_buffering off;
proxy_set_header X-MS-Proxy $host;
proxy_set_header Host $host;

https://developercommunity.visualstudio.com/content/problem/1220191/roslyncodeanalysisservice32-creates-cache-folder-o.html

In my case I believe it was trying to create the folder “\swz9AdRcXEcNN+RHxH2hk1si\E=” but as this starts with a folder separator this was treated as an absolute path rather than a path relative to %LOCALAPPDATA%\Microsoft\VisualStudio\Roslyn\Cache\RemoteWorkspace

Not sure on the wisdom of allowing folder separators in base64 folder names!

This is fallout from a change from the Server 2012 SMB MP in which they were checking for specific rule names, which failed for servers that were in non-English locales. They attempted to invert the logic from the 2012 MP script, but failed to actually take the comparisons into account. It’s pretty much a broken rule. It will ONLY pass if you have a rule on port 445 that is disabled.

Just like you, I have no idea where to report this either. I’ll see if I can let Kevin Holman know. He might know who to report it to.