Environment
Irrelevant. Occurs both on Android and iOS. Replicable in the playground.

Describe the bug
When applying a background to a label with a formatted string, the background is re-applied in the inner <span>s. This is a problem when we have a semi-transparent background, as you can see here:

To Reproduce
Run the sample here: https://play.nativescript.org/?template=play-vue&id=x0j7SP

Expected behavior
The background should only be applied to the label, and not in the inner span again.

Sample project
https://play.nativescript.org/?template=play-vue&id=x0j7SP&v=2

Additional context

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