Interested to find out what this second pipe consists of

Other than restricting the pressure and risking oil leaking past seals instead, I truly don't think there's a fix that will work with the factory breather position without taking the box apart and doing it properly.
I ended high up behind the rear bumper with an oil catch can and still it squirted like a whale's blowhole, I canna go any further captain ?
funny enough, I went through the China Mulan's discussion and found interesting information, the guy has done about 8500miles on his Mulan, it seems he been told by the dealer following story:
1, the oil leaking is a overfill oil issue (the same as what we been told in the UK originally).
2, no fix required for the overfill oil issue, the gearbox will push the excessed amount oil out of the gearbox, just let the oil goes
3, the issue is fixed when the excessed amount oil been pushed/throwed out
in addition to this, I have got few replies from someone on the same forum and I believe he is from a local dealer in China, here is his comment for the issues that we have got here:
19th Dec 2022 reply
undertray deform issue, the manufacturer has a new design/improved version, owner can go back to dealer (they call 4S) to replace the under tray.
oil leaking, the manufacturer test shows the breath pipe oil leaking only happed when the motor speed reaches 17000RPM, just need clean up. Motor will not reach such high speed in normal use, so no need to warry.
1st Feb 2023 reply
oil amount has been adjusted, now new solution for the oil leaking is replace new designed breath pipe. The first batch production cars have the straight version breath pipe, not enough space to separate the oil and air, the new design is a bended version.
7th Feb 2023 reply
I told him that my car still leaking after fitted the new breath pipe, and here is his reply:
Is it the same place has leaking? Our store only received 1 or 2 complaints about the oil leaking, no leaking reported since replaced the breath pipe.
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The SAIC knows the issue and communicated with dealers in China and the UK, and it sounds like SAIC provided the same story.
For sure, SAIC knows the fact that the issue is their original design can't separate the oil and air on the gearbox breath pipe.
Personally, I believe you are correct and I can not see how the breath pipe can separate the oil and air in the current design. Can't tell the inner OD's size, but surely no space to separate the oil and air.
I believe all MG4/Mulan will leak until SAIC provides a proper solution to separate the oil and air. The difference would be what amount and when.
*picture borrowed from someone' post in here.