ASS Subtitles get shown wrong

In the latest Version (3.0.18) some ASS Subtitle tracks are shown incorrectly. On the Subtitle Files that i want to play, there should be white text surrunded by a thick border in black or sometimes other colours. But this Border is missing or at least it is only a very small border, not like it should be. With the last Version (3.0.17.4) it still worked.

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