Out of all 495 third-place qualification scenarios, B3 🇧🇦🇨🇦🇨🇭🇶🇦 is paired with E1 🇩🇪🇪🇨🇨🇮🇨🇼 in exactly one of them.
It happens only when the eight third-placed teams that advance come from groups B, E, G, H, I, J, K, L.
Equivalently: the four third-placed teams that fail to qualify must be precisely the ones from groups A, C, D, and F.
Any other combination of eliminated thirds sends B3 to play D1 🇺🇸🇹🇷🇵🇾🇦🇺, assuming B3 qualifies.
What would have to happen for it be E1 vs B3?