The imported methods are not visible

[sap2abap]

The imported methods are not visible in the class builder, but they are visible in the source code. (version 7.16.0)

[larshp]

@sap2abap was the code imported using the latest abapGit version?

[sap2abap]

@sap2abap was the code imported using the latest abapGit version?

Yes

[sandraros]

It's not an abap2xlsx issue. If it's not an abapGit issue, it's an SAP standard issue (check the SAP notes). You may also run the standard repair options like Utilities > Regenerate sections or Utilities > Cleanup > Method includes.