Tx!! Worked perfectly! No need to download Gboard, soft reboot & opening WhatsApp as described did the trick.
Encourage everyone to try this solution as it really did work seamlessly. Frustrating that you have to download app & review it before even testing to see if it works, but my gifs & stickers are all back. Didn't resolve my missing auto- remembered text tho' 😥
As recommended by others, left feedback regarding my frustration & desire for Samsung to fix in next update. Sadly, my auto-text history is likely long gone.
Ok everyone I literally just fixed the issue about 5 minutes ago so here it is.
Settings>Apps>3 dots in the corner>Show system apps>Search Keyboard>Clear data for Samsung keyboard.
After clearing the data, when you go try to use stickers or GIFs again, it will direct you to the Galaxy store where you install a certain app. After installing the app, your keyboard will have all the stickers and GIFs like it used to.
I hope this helps.
I tried the previous solution and it did not work for me. However, I did go to the playstore and downloaded the Facebook Lite app and that is allowing me to post Bitmoji and GIFs.