Hi @Dengfeng_Yan,
The issue is not the importing of the coverage report. We only report the coverage on the changed lines of a PR. In the first screenshot you shared the scanner is able to detect that there are 62 new lines, however in the second screenshot there are 0 new lines detected.
We rely on complete git history to be able to detect the lines that were added in a PR, this user had the same problem in the past and was able to solve it by using a different command to git clone the repository.