Masked input affected by typing in another field in case using function for v-mask

[speker2010]

V-Mask and Vue versions

2.30, 2.5
vuelidate: 0.7.7

Reproduction Link

https://codesandbox.io/s/v-mask-demo-forked-6cscv2

Steps to reproduce

1. Configure vuelidate rules, for example on "phone" input
2. Use function for v-mask like v-mask="someFunction", for example on "phone" input
3. Type something in another field, for example on "first name" input
4. You'll see that "phone" field makes validation

What is Expected?

When I type name, phone is untouched (dirty === false in vuelidate model)

What is actually happening?

When I type name, phone is changed and validations kick in. (dirty get updated to true in vuelidate model)

[tokkerbaz]

Any updates here?