Problems with editing time signature changes in Logic Pro X.

I do pieces with lots of time signature changes (e.g. 5/8 to 7/8 to 3/4 etc), so I sometimes have 50 or so in my time signature list for a single piece. I know how to put them in, but I run into problems if I want to edit them afterwards. Whenever I change a time signature early in the piece, that causes some later time signatures to be lost. An example is given in the screenshots: 'timesignatures 1' shows a 7/8 bar that I would like to change to a 9/8 bar; 'timesignatures 2' shows that after doing so, two of the later timesignature changes have disappeared. I also attach an example of what happens when I try to move a group of key signature changes to later in the piece: 'timesignatures 3' shows that I have selected a group of 16 time signature changes to move; 'timesignatures 4' shows the result: the group (or at least the first in the group) has moved by 22 bars, but 8 out of the 16 time signature changes have been deleted.

Just to state the obvious, none of this affects playback, but it makes transcription into written notation a real headache. In effect, if I change my mind about any of my time signatures, I have to resign myself to deleting all the subsequent ones and inputting them again.