I tested this problem in the new snapshot, and with some brief experimentation, found it to have been fixed. I did find other problems though in the snapshot, which I will post as another thread later. Thank you for your time.
Upon experimenting I have found that this issue may be solved via replacing all previously framed maps with the new updated version of it. Because I use a copy of the map to update them, the ones in the frames automatically “update” when the copy is modified. I have found that this update does not stick unless all maps that are framed be replaced with the new modified version of the map. Its a bit of a hassle because my map walls are about 1000 blocks from each other, but it is a fix nonetheless. I have been doing this in creative mode, which may have contributed to the issue, allowing me to make exact copies of the maps used. Thank you for your help nonetheless.
Sorry, it was 18w33a.