Adding time signature breaks a tie across barline
If two note are tied across a barline, and a new timesignature is added to the second measure, the tie is broken. In 3.0 this always happens.
In 2.3.2. it does not happen if the added timesig is the same as the current one, but it always happens if there is a change in timesig.
Workaround is to add the tie again after the timesig has been entered.