Yes, it’s the same thing. Derrek’s workaround solves the problem. Or perhaps I should say, masks it, because the oddity is that the note that has to be forced isn’t necessarily one of the ones that Dorico changes.
In your example, as a minimum, press T while still in input mode after inputting the dotted quarter, switch on force duration then input the dotted half. Either stay in input mode, press T again and then enter the sixteenth notes or, if you’ve inputted them beforehand, come out of input mode and press T while the dotted half is selected. As far as I can work out, the only note that has to be force duration is the one immediately before the barline (but this may just be the case for the examples discussed so far). You definitely have to use T in input mode after each note that is to be tied, other than possibly the forced one. To be certain, force duration and T in input mode for all the notes to be included in the tie seems to work. (Not T for the last note in the tie of course!)