If I edit (for example) the Woodland area in a color theme in the current Android beta version, and tap on the sample square patch at the bottom of the screen, I get a choice of solid, transparent or pattern fills. If I choose a pattern fill, for example trees, the sample square shows instead a line of 'x's across the centre ("road blocked fill" for line). When the new theme is applied to the map, no pattern appears at all.
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