Then I import the XML file again. Since Dorico 5.1.60, time signatures are now shown on every special bar line (repeat, double…). This was not the case in the previous version.
In Dorico a bar line change is a time signature (change). Since (IIRC) this does not always mean bar line changes from XML manifest as visible time signature, I would propose that this is something in the XML that trips this in Dorico–and it is easy enough to fix, unlike some instances where voices an rhythms become tangles in XML imports.
Those time signatures are there in the MusicXML, and indeed you get the same result if you import them into an older version (e.g. Dorico v4). So I think the difference must be in the export rather than the import. Could you post the original Dorico file that you are exporting?
Here’s the Dorico file.
This problem did not happen with the previous version of Dorico.
I imported the file also in Finale 27 without problems, no additional time signatures. testprojekt.dorico.zip (471,6 KB)