[Flutter SDK 2.0.0] addSymbol / addLine not working (regression from v1.x)

[Krishita198]

In mappls_gl: ^2.0.0:

• addSymbol throws:
  Bad state: No element
  (worked fine in 1.x)

• addLine crashes with:
  PlatformException(error, Attempt to invoke virtual method 'long com.mappls.sdk.plugin.annotation.Line.getId()' on a null object reference)

Both features worked in the old version but are broken in 2.0.0.
Please confirm if these APIs are supported in the new SDK, or provide updated usage examples.