.sync is throwing a null when the input value is empty

[princebatey]

Version

2.6.14

Reproduction link

github.com

Steps to reproduce

write a custom input
write properties
write :value.sync="propertiesBasic.profession" for example
i am using this property because i want to bind two values from client to my dashboard

What is expected?

i want to get nothing when the input is empty

What is actually happening?

But i am getting null

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here is the code: