[bug] @unocss/transformer-variant-group transforms empty variant when there is extra space after ( and before ) and between classes

[itsmnthn]

It seems @unocss/transformer-variant-group generates extra class on class attribute when there is space after ( and before )

For example below code transforms

<div class="before:( dark:bg-dark bg-light opacity-0 ) hover:( before:opacity-100 )" ></div>

as below

<div class="before: before:dark:bg-dark before:bg-light before:opacity-0 before: hover: hover:before:opacity-100 hover:" ></div>

For each extra space inside () we have empty variant as mentioned in above example

[david-plugge]

Same issue here and vscode does not provide any information about the class without a space.