$watch callback triggered by unwatched data

[DiskoPete]

Summary

I stumbled across an issue where an Alpine data triggers a $watch callback of another data.

To demonstrate the issue I created this codepen snippet:
https://codepen.io/DiskoPete/pen/MWpdNpX

Steps to reproduce

1. Change value B
2. Note that b is watched and will trigger this.submit()
3. Afterwards enter text for value a

Results expected

$watch callback for value b isn't triggered when we change value a

Actual results

After the value b $watch callback is triggered for the first time, the callback will also be fired if we change value a.

OS/Browser

macOS 11.4; Chrome 91; alpinejs 3.1.0

Other

Thank you very much for your time and effort you put into this! 🚀

[vladrusu]

I have a similar issue:
#1545