[Android] Updating sticker packs + packs with 1 sticker

[DemiLo20]

Stickers

• [ x] My stickers do comply with the sticker requirements (512x512 and < 100 KB)
• [ x] My tray icon does comply with the requirements (96x96 and < 50 KB)
• [ x] I am using WebP images for stickers.
• [ x] I am using PNG images for stickers.

Problem Description
Hello. Two issues:

• When updating the image_data_version my sticker pack is not updated. Whatsapp gives me "The pack is already added" response. Is there anything else I would need to change for the pack to be updated? Id and the rest of the data are correct.
• Is there any way to add a pack with a single sticker? I have seen apps only (like Sticker.ly) do it 🤔

Thanks!

Reproduction Steps
[FILL IN WITH DETAILED REPRODUCTION STEPS]

Head of Commit
[Do you have the latest commit from master? If not, please update your repo to the latest commit in master, and try again. If issue still occurs, please note down the commit hash (from this repo) here:]
[Commit hash]

Links
[FILL IN PLAY STORE LINK AND/OR LINK TO SOURCE CODE ON GIT]