Firefox automatically triggering postMessage in Hosted Tokenization

This looks more like a defect than a question or a discussion, but:

1) In latest Firefox (72.0.1 64-bit on Mac), load the url:

2) In dev tools, check Network activity and notice an infinite loop of requesting card verification (and failing).

Originally, I noticed this by loading my profile in an iframe, although it seems to only load one request when the iframe is first initialized.