I imported a DXF using the professional version qcad-3.27.6-pro-linux-x86_64 and all text strings have codes prefixed to them like "ql;". When opening in QCAD qcad-3.25.2-trial-linux-x86_64 the text loads correctly though. Others have confirmed that this seems to be a regression and a non-issue in other viewers: https://www.qcad.org/rsforum/viewtopic.php?p=37667

Here is a file with a single circle and single text number "1" which currently appears as "ql;t0;1".