Is it possible? Of course it is, under the proper circumstances...but by the same token it can result in tears as well, under the wrong circumstances. A soft backing layer under the pond liner (mine is old carpeting) is very helpful, and of course there are different thicknesses of liner so the thicker ones are more durable. As
Fishman Dave
stated, an additional protective layer right under the wood, such as an extra piece of liner, is a good idea.
Probably the most important factor is the wood itself. An old waterlogged piece of wood, with all corners and sharp edges worn down by time and/or pleco feeding action is pretty harmless. A relative new piece festooned with jagged points and sharp edges is an accident waiting to happen. If you have that type of wood, working it over thoroughly with a wood rasp or coarse file to remove all those pointy pokey things is time well spent.