The Form Submit solution using fs-formsubmit-element="reset" does work across multiple component instances, but there are a couple of things worth checking.
First, make sure the core attributes are in place on each instance:
fs-formsubmit-element="form" on the Form Block
fs-formsubmit-element="reset" on the clickable reset trigger element
The most common issue we see is when multiple form components live on the same page. In that case, you’ll need to add fs-formsubmit-instance to a common parent wrapper for each instance, with a unique value per instance:
Without that, the instances can conflict with each other and cause exactly the kind of behavior you’re describing.
A couple of quick questions to help us narrow this down
On any given page, are you working with one form component or multiple?
Could you share a real staging or published URL where the reset isn’t working? The link in your post looks like it might be a placeholder.
Being able to inspect the live DOM will help us see whether the attributes are being picked up correctly by the script. Once we can see what’s actually rendering, we’ll have a much clearer picture of what’s going on.