Can't load macOS plugin in Unity 2017.1 (libmono.0.dylib image not found)

I'm trying to upgrade from Unity 5.5.3p3 to 2017.1f03. The WebView plugin is not working in the Unity Editor when running on my macOS machine. I receive this error in the console:

Couldn't open /Users/adam/dev/game/Client/Assets/Plugins/WebView.bundle/Contents/MacOS/WebView, error: dlopen(/Users/adam/dev/game/Client/Assets/Plugins/WebView.bundle/Contents/MacOS/WebView, 2): Library not loaded: @executable_path/../Frameworks/MonoEmbedRuntime/osx/libmono.0.dylib
  Referenced from: /Users/adam/dev/game/Client/Assets/Plugins/WebView.bundle/Contents/MacOS/WebView
  Reason: image not found

One thing I've noticed is that Unity changed the location of the libmono.0.dylib file between 5.5 and 2017.1 (not sure about 5.6). Whereas before it was located in Unity.app/Contents/Frameworks/MonoEmbedRuntime/osx, it's now in Unity.app/Contents/Frameworks/Mono/MonoEmbedRuntime/osx, presumably to support the upgraded Mono engine work they're performing (there's also a MonoBleedingEdge directory as a sibling to the Mono directory).

I'm not sure if this is a Unity bug or something you can fix with your plugin but wanted to bring it up here. I'll also be filing a Unity bug just in case.

Start by examining the WebView.bundle loading path shown in the error and compare its referenced MonoEmbedRuntime location with the Unity 5.5 and 2017.1 framework paths described in the report. Reproduce the editor load on macOS with Unity 2017.1f03, then determine whether the plugin or Unity owns the path mismatch. Done means the WebView plugin loads without the libmono.0.dylib error, or the issue is confirmed as a Unity bug.