Apple iOS Processing Failing: ITMS-90338: Non-public API usage

We've been using this library for a while within our app and we're just now getting an error thats blocking us from submitting builds to Apple.

ITMS-90338: Non-public API usage - The app references non-public symbols in Frameworks/flutter_web_auth.framework/flutter_web_auth: _SFAuthenticationErrorDomain. 
If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. 
In addition, note that one or more of the above APIs may be located in a static library that was included with your app. 
If so, they must be removed. For further information, visit the Technical Support Information at http://developer.apple.com/support/technical/

This started this afternoon with no code changes from our end, and at first glance it seems like there are not references to said classes within this plugin, but it's getting flagged anyways

Start with the reported Apple submission failure and inspect Frameworks/flutter_web_auth.framework for the _SFAuthenticationErrorDomain reference. Confirm the source or bundled library responsible, then verify that an iOS submission no longer reports ITMS-90338.