No graph visualization on Blob Opera

[hoch]

Reproduction:
Visit https://artsandculture.google.com/experiment/blob-opera/AAHWrq360NcGbw?cp=e30.

Expectation:
Contexts should register in the drop down menu, and the panel displays the visualization.

[hoch]

The integrated Web Audio panel shows correctly. (three dots > More Tools > WebAudio)

[Diex]

same here:

Chrome is up to date
Version 101.0.4951.64 (Official Build) (x86_64)

maxos: 10.13.6