Cart and Mini Cart blocks: error when changing the quantity of a product

[Aljullu]

To reproduce

1. Add the Mini Cart block to a post or page.
2. In the frontend, click on the button and see the drawer open.
3. Try changing the quantity of a product or removing one product.
4. Notice there is an error in the console:

Kooha-11-23-2021-10-39-13.mp4

[Aljullu]

This issue is also happening in the Cart and All Products blocks and seems to be specific to WP 5.9.

[Aljullu]

After some investigation, this seems to be a bug in the Query Monitor plugin (I had it active while testing). If I'm not wrong, the issue was introduced in Query Monitor 3.7 and it's still present in Query Monitor 3.7.1. However, I tested with trunk from the repo and it seems to have been fixed there.

So closing this issue.