We don't provide end user support for mainline H3/H5/A64 with a reason. It is extremely hard, expensive and usually complete waste of time since things are moving too fast. I barely find time to answer you this, for finding a problem I might spend a day, hour, a week? Those builds are considered beta/testing and if something doesn't work ... you are on your own or wait.
Linux kernel is a work of many people. I have no idea what they did in the last couple of days that this stopped working.