Unfortunately you're right... the trouble is still here...And nobody cares...Little troubles for people not so rich to spend $2000 to change a lens that was working very well on Canon 6D...
That's what it is written in the new firmware notes:1.Corrects an erroneous display that appears when some third-party accessories are attached. Anyway i will check it with more accouracy and then i will let you know...
I have to check with more accuracy but maybe i have solved the problem with the 24-70mm f2.8 tamron with the last firmware of the canon 6d mark II : 1.0.4Good luck!