Text "Read more" do not apear in "trimmed mode"

The text in the text field can be trimmed and the right number of words are shown.
But the rest of the text can not be activated with "read more (learn more)" because "read more" is not available.
Behaps the trimm lenght limit the complete field and "read more" is in the not shown part.
The bug is not only in the "trimm standard" also together with the "Smart trim module".

Unfortunately I do not understand your comment.

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I´ve filled the info below.

I don't think this is a bug in Drupal. Trimmed text displays are typically used in combination with Views to link to fuller displays of nodes.