[iOS] One of the stickers in this sticker pack has an invalid asset

[Jeanno]

Specifications
OS Version: iOS 17.x
Device Manufacturer: Apple
WhatsApp version: >= 24.9.1

Stickers

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

Problem Description
Users start to receive the error message "One of the stickers in this sticker pack has an invalid asset" since the WhatsApp update 24.9.1. Stickers used to be able to added to WhatsApp (before 24.9.1) now throws this error message instead.

Reproduction Steps

1. Add stickers from this page to WhatsApp
   https://www.sigstick.com/pack/dCWpSTPcC1xR9uKnKEHf

2. The error message "One of the stickers in this sticker pack has an invalid asset" is shown

Note: Not all stickers can reproduce the error.

Links
Example stickers that experience this problem.
https://www.sigstick.com/pack/dCWpSTPcC1xR9uKnKEHf

[Jeanno]

@tomw Would you please also take a look at this?

[Jeanno]

Looks like this problem has spread to Android. Is it because of a shared webp decoder between iOS and Android WhatsApp?

[tomw]

Thanks, we're investigating

[Jeanno]

Thanks, we're investigating

Not all stickers in that set has the problem. I tried to separately install them and only a few of them can trigger the error.

I have a few more other stickers with problem. Let me know if you need them.

[MarsVard]

Any updates on this?

[Jeanno]

Any updates on this?

Are you experiencing the same?

[tomw]

Yes, we can reproduce the problem and are actively working on fixing it. Thanks for the report & test case.

[lijianyou-Herve]

Yes, we can reproduce the problem and are actively working on fixing it. Thanks for the report & test case.

Can you tell me which part of the encoding specification doesn't meet. I hope I can deal with it as much as possible, so that I don't need to wait for you to deal with it, which is very important for our project, because the negative reviews of apps are increasing

[tomw]

The fix is on its way, and will be in the 2.24.11 releases. The chunk size of ALPH was seen to be unusually small (2 bytes), which we've rarely seen before, exposing a corner case bug in our code. Hope that helps. Sorry we can't get the fix out faster – these are our usual app release timings.

[Jeanno]

The fix is on its way, and will be in the 2.24.11 releases. The chunk size of ALPH was seen to be unusually small (2 bytes), which we've rarely seen before, exposing a corner case bug in our code. Hope that helps. Sorry we can't get the fix out faster – these are our usual app release timings.

Thanks for the detail, Tom.