Hi @Marius,
Thank you for the report and thorough details.
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This should be fixed in our next update.
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This isn’t a bug but a current limitation. We are planning to address it as soon as possible, but it does require a bit more time than we currently have available. I think this rejoins: Effect for Pseudo-Class(Ex: :first-child) doesn't show live preview in the editor
It is definitely a top priority!