Confirmed on my a570 too: Tv override combined with Tv bracketing only works properly if Tv override is set up using factor option, but not if it set up using the Ev step option.
By all likelihood the fault lies in the same place as before, i.e. platform/generic/shooting.c function shooting_tv_bracketing().
edit: I think adding extra long exposures to the enumerated list of Tv is what broke this (but the person who did that should not be blamed for it, he just ran into a trap
). If I'm not mistaken, this bug only exists on cameras that support extra long exposures (beyond 64 seconds). Anyway, I guess changing shooting.c line 1097 from
bracketing.tv96 = 32*(conf.tv_override_value-18);
to
bracketing.tv96 = 32*(conf.tv_override_value-tv_override_zero_shift);
will fix this.
I didn't test it yet.