WebGL2 not displaying transparency correctly

I tried switching from the WebGL to WebGL2 for WASM but the transparency around images is not displaying correctly.

This is the WebGL one:

And this is the WebGL2 one:

What's odd is the images appear fine if they are layered onto a vector graphic like the portraits, but not onto another image. You can see how things like the arms and legs have a bad border.

Here's an example character that I'm having trouble with.