The joint venture is a site where huawie demo their release to the intelligence community.
Id guess the following issues have occured
1 - They been unable to build the exact same release from source
2 - They dont manage 3rd party deps - letting core components go out of support.
3 - they cant fix issues as they arise.
The 3rd is the worse as it points to huawei running out of engineers.
This will be compounded further by huawie basically being a ponzi run by red army. If the stock falls then its grunts have nothing to show.