Hi Alberto,
I suggest you to check if an issue report is already present on
https://github.com/qgis/QGIS/issues . If it is not, it would be very
useful if you created an issue report on
https://github.com/qgis/QGIS/issues providing all the requested info and
a QGIS project in order to replicate the issue and specifying which QGIS
version wasn't affected by the issue.
Regards.
Andrea
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