I found a simpler temporary fix to bugs with ramps and ground textures: in “regional settings - formats - additional setting” you need to set “Decimal symbol” to “.” (dot). No need to change a whole system region/language, no need to reboot. As I see it, it is a bug in XML parsing, that uses system settings to parse real numbers.
Edit: As this post become pretty popular, I need to clarify one thing: you need to change “Decimal symbol” for numbers, not currency.
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