I faced this problem many times in different projects. In this case it’s just a semi visible png picture. As u can see on the preview it exists but in-game and in Piskel it’s invisible. In another object i had an animation of red blood explosion and it was invisible as well while even not all of it’s sprites had an opacity below 255. Any explanations and fixes, guys?
Piskel doesn’t support transparencies at all. If you’re trying to load a transparent image into Piskel, if you save your changes it will either remove all transparency, or won’t display it.