[Sequencer Bug?] Frames are pasted empty between channels in Sequencer

Context: I’m importing a cube from C4D that has its scale animated. I’m trying to copy the keyframes from the X scale channel into a material parameter channel in the Sequencer.

Error: keyframes are pasted but values are discarded, all set to 0.0 (the original keyframes are float values between 0-1).

I tried using a Material Parameter Collections as well, and tried with both scalars and vectors, but they are always pasted as Cubic (auto) frames with value 0. It works if I paste them into another transform channel.

Any clues why this would happen?