BUG: Variable default value

[volodymyr-volynets]

What browser are you using?

Chrome 149.0.7827.54

Describe the bug

How to reproduce the bug?

1. Try to add a variable and set default value.
2. Default value is not set.

What is the expected behavior?
Variable default value set and displayed on canvas

What is the current behavior?
Default value is not set and when saving we can see empty span without default value:

<span data-type-data-variable="" id="iovfd"></span>

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