The cube itself has a side length of 2.5 cm. The text currently has a depth of 0.5 mm. However, I had already tried a depth of 1 mm, which led to the same result.
If I rotate the cube by 90 degrees around the Y-axis, so that the upper side of the cube is no longer on top, it is cut correctly.
However, the text that is ultimately at the top or bottom is never cut correctly.
text_cube.stl