I did a series of testing using Stellarium (plus StellariumScope) via EQASCOM on Windows: slews, gotos, highspeed/lowspeed, and tracking all seem to work correctly still. I believe the Windows EQASCOM driver was sending the :G command before all (or almost all) :J commands, and therefor working around the problem.
As posted on GitHub, I tested the functionality using Linux, everything seems to have been fixed.
I'm volunteering for a camp out this weekend with the local Astronomical Society, I'll let you know if I notice any other issues.