Why word candidates do not appear when I advance to the next segment after confirmed the current segment?

Hi, I use Trados Studio 2021 and usually have a trouble after moving the current segment to the next segment.

When I advance to the next segment after confirmed the current segment, word candidates do not appear in the next segment.

For example, after confirmed a segment No. 10, I advance to the next segment No. 11.

However, word candidates do not appear at all in the segment No. 11, and the phrases on the source side do not have indications such as red lines.

In this case, I must further advance to the segment No. 12 once and then return back to the segment No. 11 that is still not completed.

Only after this step is performed, the phrases on the source side are indicated by red lines, and word candidates appear in the segment No. 11.

Each time I advance to the next segment, I have to do this step.

Please give me your advice above this problem.

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