Update This bug was fixed in Patch 1.21.32 Problem My Sims become 2-Dimensional and don’t slide over the slide at all. They do appear at the other end after the end of the animation. Cause This issue is caused by Intel Graphics Chips (Mac and PC) and Nvidia cards with old drivers. Solution If your computer has both a graphics chip and a graphics card, make sure the game runs on the card. Also make sure that your drivers are up-to-date. EA has released a beta fix: Beta Fix For Lawn Water Slide Animation Issue On Backyard Stuff Pack. Log into the forums…
Give your Sims a backyard they can really enjoy with The Sims™ 4 Backyard Stuff! Add fun lawn water slides and colorful new objects to spice up the space. Slip into something a little more comfortable, and remember to keep plenty of lemonade on hand.