Generally speaking, that sounds normal; the weak praying on the even weaker
Of course, if Bavaria is still allied to France, and AUS or PRU are DOW'ing BAV anyway, and thus going to war with BAV AND FRA, that would be not only dumb, but if FRA and XXX have peace treaty in affect, IIRC such a behavior should have already been eliminated; no causing war between majors with a peace treaty still in affect, through war with allies.