Just in case it hasn’t been identified, it seems “go to rehearsal mark” in the jump bar is not working in Engrave mode.
For example, if I type in “r20” (without the quotes) in the Go To field, it doesn’t doesn’t do anything, while it jumps to Rehearsal mark 20 if in Write mode. Since “b100” works in both modes, I presume this is undesirable behaviour.