In
Project Settings, under
Language Pairs > All Language Pairs > Translation Memories and Automated Translation > Search, the
Minimum match value is
70 by default.
If you set the
Minimum match value to 100 for the batch task
Pre-translate and in the TM there is no 100% match, Trados will still see the fuzzy matches (anything between 70% and 99%) and will not pre-populate with MT the segments that are not 100% matches. It will only pre-populate the segments that are under 70% minimum match value.
Please try to Pre-translate the files with
Minimum match value in the pre-translate step equal to the
Minimum match value in the Translation Memory
Search.