Hello
There is an issue with default value for signaturePad and visibleIf condition.
Here is an example:
https://codesandbox.io/s/fervent-shockley-4c7m0
You can see that survey has 3 types of questions: text input and two signatures. Both of signatures are the same, have the same default value, but field2 has visibleIf condition: {field1} notempty
. On the test tab you can see that field3 displays defaultValue, but if you give some value to the field1 - field2 shows without default value.