0.17.1pre5 does not compile on Unity 2020.3.48f1

Description
After installing 0.17.1pre5 on a unity project and opening it with Unity 2020.3.48f1, Unity indicates there are compilation errors and shows these two lines:

Library\PackageCache\com.microsoft.mixedreality.webview.unity@dc3360005667\Runtime\Editor\EditorWebView.cs(19,70): error CS8124: Tuple must contain at least two elements.
Library\PackageCache\com.microsoft.mixedreality.webview.unity@dc3360005667\Runtime\Editor\EditorWebView.cs(19,71): error CS1526: A new expression requires (), [], or {} after type

Version 0.17.1pre3 compiles and runs correctly.

Version
SDK: 0.17.1pre5
Runtime: Unknown, how do I find this information?
Framework: Unknown, how do I find this information?
OS: Windows 10 Enterprise

Regression
Was this working before but has regressed? Yes
If yes, what version did this last work on? 0.17.1pre3

Repro Steps
Create a Unity project on unity 2020.3.48f1
Use Mixed Reality Feature Tool to install 0.17.1pre5
Open Unity

Expected behaviour:
Everything compiles and runs fine
Actual behaviour: compilation errors mentioned above

Screenshots

Additional context