WAT?

gistfile1.txt

The GL_TRANSFORM_FEEDBACK_BUFFER buffer binding point may be
passed to glBindBuffer, but will not directly affect transform
feedback state. Instead, the indexed GL_TRANSFORM_FEEDBACK_BUFFER
bindings must be used through a call to glBindBufferBase or
glBindBufferRange. This will affect the generic
GL_TRANSFORM_FEEDBACK_BUFFER binding.

Likewise, the GL_UNIFORM_BUFFER buffer binding point may be used,
but does not directly affect uniform buffer
state. glBindBufferBase or glBindBufferRange must be used to bind
a buffer to an indexed uniform buffer binding point.