Do you mean while it's still inside?
If you hop out of an open top vehicle that is targeted by a snare it will switch targets to your infantry, there isn't a known way to fix this. Especially noticeable with the AT satchel sticking to infantry that hop out of the 250 because of how sloooow it is.
Uploaded it: https://www.coh2.org/replay/85162/m3-ht-faust-bug