What's the movie where animals go on a field trip and one of the animals didn't say I love you to their mom before they left the forrest... and when they got back from the field trip something happened to the forrest... their was a wreck or something with a 18 wheeler I think and it might have been gas that got in the forrest... but I'm not sure.. but when they got back his parents were gone and the forrest was empty??

Once Upon a Forest (1993)

Thank you, thank you, thank you .
I swear I have been trying to remember this movie for a few years !
I just finally posted up a question on something hoping for an answer lol