When I update vscode-languageclient and vscode-languageserver from 3.0.5/3.0.5 to 3.1.0, my language server stops loading. I've tried to minimize the server to just printing something to the connection's log in onInitialize, but the server never seems to load, I cannot attach a debugger to the server, and the client never reports that the server is ready.

platform: Windows 8.1 64bit
vscode: 1.10.0-insider 40fecfaa77f01672e8a147be71f7ccb9cf8a12, and 1.9.1 release
vscode-jsonrpc: I've tried both 3.0.4 and 3.1.0