Hallo Mr. Ay,
I made some tests and I can confirm that the issue affects the "To node" only (both You select "To" and " Both" in "Flange checks" spreadsheet).

I noted the same issue when I import a file from previous CII 2018 SP2 HF1.

Attached You'll find v. 10 and v. 11 custom reports.

Thanks.
Best regards.

Alessio