BlendMode MUST BE applied for each combination of blend modes.

But this is not happens when a src = ZERO.
Combination [ZERO, ONE_MINUS_SRC_ALPHA] known as DST_OUT composition operation and used as inverse mask on framebuffer (for producing holes) with soft edge.

https://github.com/oframe/ogl/blob/master/src/core/Program.js#L134
https://github.com/oframe/ogl/blob/master/src/core/Program.js#L141
https://github.com/oframe/ogl/blob/master/src/core/Program.js#L119

This wrong, because only transparent filed can be used for checked for setting blend state.

Any changes of this is BREAKING and need publish new major version.

Demo:
https://OglBugState.exponenta.repl.co

src:
https://replit.com/@eXponenta/OglBugState#script.js