How do I get rid of black alphas?

Surprised to not find this already answered by searching forum. Closest I got was someone saying it only happens in Chrome, so switched to Edge and still same issue. Happens in both preview and even Steam Deck. See image for difference between alpha in C3 image editor, vs in game, where alpha turns to black instead of clear. Note this happens to every single image in the game, not just one. If it matters, project was originally made in C2, and opened in C3. Unsure what general image setting or otherwise determines alpha being black instead of clear. 100% clear still ends up 100% clear as it should, but all gradients between color and clear end up black, as if the 'background of alphas' is black instead of clear, until it gets to the point of being totally clear.

Hi. Can you post a c3p file with a small piece of the problem. We will give you an answer faster.

I see. I don't have that plugin and can't test it. Perhaps people who have this plugin (Plugin Scml (Spriter) by BrashMonkey) will come into this room and check.

I think in the support thread for this plugin should be asked.

I was VERY clear that the issue is irrelevant to Spriter. The addon is free and could be installed and uninstalled after. Every image in the project has the issue, but it took too long replicating the issue with a single sprite/png in a new empty project, to upload it. It's such a big issue and happened automatically (upon opening a C2 project in C3, which may be irrelevant to the cause). Whoever knows about this sort of thing, what causes the alpha to appear to have a black background instead of clear? No effect is applied, of course, as it happens to every image in the project. No overlay screen effect is applied either. I don't want to dedicate more time to fitting a ridiculous no-Spriter requirement to get help. I'll replace this if I pull it off.