Bad request for import sticker from Line

[Luckycarrot69]

因為sticker dimension 所以bad request

[bellybilablu]

metoooo

[Minato1123]

I'm having the same issue.
The error happens on different indices each time, even when using the same sticker set.
It’s not limited to a specific image.

For example, this time it failed at index 14:

Failed to add one sticker.
一張貼圖添加失敗.
Index: 14
Error: telegram: Bad Request: STICKER_PNG_DIMENSIONS (400)

[yzu1103309]

Same issue here.
The official bot seems broken recently with no response.
So I self-host one, but this error keeps occurring and the sticker set can't be imported correctly.