After JDK-8204568 was integrated, running with 17-ea+3 or later, under certain conditions it happens that some nodes get wrong CSS properties from other nodes.

The attached test case shows that after hiding the stage, when showing it again the Labels after the Button take the button's padding and background properties.

The test sets by CSS a font size different than 13 px (default for labeled controls). Using 13 px or removing it works fine. 

Also, a Button and some other controls like a CheckBox, a ComboBox or a Spinner are required in the scene.

After pressing the button, that simply hides and shows the stage again (see AfterHideAndShow attached pic), the logs from CssStyleHelper::recalculateRelativeSizeProperties show that these properties are wrongly set for Label "Text 2" (also for "Text 4"):

-fx-padding, call applyStyle: ObjectProperty [bean: Label@5cc81f36[styleClass=label]'Text 2', name: padding, value: Insets [top=0.0, right=0.0, bottom=0.0, left=0.0]], value =Insets [top=4.3, right=8.7, bottom=4.3, left=8.7], originOfCalculatedValue=USER_AGENT
-fx-region-background, call applyStyle: ObjectProperty [bean: Label@5cc81f36[styleClass=label]'Text 2', name: background, value: null], value =javafx.scene.layout.Background@4d573d15, originOfCalculatedValue=USER_AGENT

Running with 17-ea+2 or lower, or reverting the fix for JDK-8204568, solves the issue.