Impermeable face doesn't seems to work

Dear developers,
I have a regular case, but the impermeable surface in the case always feels like it can’t hold back the gas. I want to block the gas on the left side and let gas pass through a continuous pipe on the right side. Can you easily help me check this, thanks.
The version is mfix-23.3.2.
cyclicsystem_2023-12-11T075720.410577.zip (64.5 MB)