Kernel runs indefinetely in Active Events popup while "Successfully ran" in the kernel page

After `kaggle kernels push`, kernel appears in the Active Events. After a few minutes "Successfully ran" appears in the run page. The code output is also OK. However, the status of the run in the bottom left popup does not change, it is still running. Moreover, the result is invisible from the competition "Submit Prediction" page. Furthermore, I've tried to submit the outputs from the run page output section. This results in the error "Could not find provided notebook". If I make a new version of the code (without changing anything in the code or data) the notebook becomes visible from the "Submit Prediction" page. The command "Stop Session" in the popup results in no effect.