This behavior was introduced in 25w33a.
As of a recent version, the movement and duration messages in the demo introduction screen have a text shadow. This may impair their legibility when the default font is used.
Linked issues
is duplicated by 2
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Comments 3
This is wierd since the shadow that minecraft applies to the unicode font is not strong as the one applied for the normal font. also, in the second image there are 2 different types of shadows
Can confirm. The issue is more obvious when using the default font.