I've been helping to troubleshoot this issue with Mike Black W9MDB who is one of the developers for the Hamlib software.
The issue turned out to be a combination of a timing issue and another minor change to the ft817 routines in the Hamlib software.
The fixes are in the master Github repository for Hamlib ().? In order to use WSJT-X 2.6.1, you need to compile the Hamlib software from the source code by cloning the Github repo, then compile WSJT-X 2.6.1 source code and point it to the Hamlib you just installed instead of the one that is bundled with WSJT-X.
I anticipate the changes will eventually make it into the next official release of Hamlib, and then eventually bundled in a future version of WSJT-X.
I have no idea when that might be, but I wanted to share the good news that there is a fix so the uBitx radio will work with the current WSJT-X software.
Dj Merrill