Sounds like the same bug I've already reported to the OpenJFX project: 
https://bugs.openjdk.java.net/browse/JDK-8236689 
<https://bugs.openjdk.java.net/browse/JDK-8236689>
It occurred for me the first time after updating to macOS 10.15 / Catalina and 
only on non-retina displays.

Unfortunately there was no progress on this bug yet.

Bye, Stefan

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