I've encountered two spiderwebs impossible to escape from before. Both of these were on map two.
On these spiderwebs you didn't simply sink through them and move at a slower pace than usual, you were completely stuck.
I know for certain that at least one of these was not an issue on my end, as my friend got stuck in the exact same spiderweb as I did.
Although the novelty of the spiderwebs is nice, if they glitch out and make players become permanently stuck and unable to play the game, they shouldn't be in the maps at all.