Cannot Load Citizen Onto Transport Under 1.60.388302

I ran into an issue trying to load a citizen onto a transport ship.  I had successfully loaded citizens onto transport ships during this game, but now they will not load and I do not get an error message of any kind telling me why I cannot load them onto the ship.

Here is a link to a save file that should let you replicate the issue:

https://www.dropbox.com/scl/fi/wooeu1gc6fy77g8uqb9ls/Cannot-Load-Citizen-Under-1.60.388302.GC4Sav?dl=0&rlkey=ovmfubqe480iw3djp8dl44vo7

Here are the steps to reproduce the issue after loading the save file:

1. Go to the Apeori Shipyard 1.  It should look like the first screen snapshot below.
   1. Notice that there are 2 transports in the shipyard.
2. Click on one of the transports to select it.
3. Right-click on a cell a couple of cells away from the shipyard to get the transport to try to move out of the shipyard.
   1. Your should get a window that looks like the second screen snapshot below.
4. Try to drag any of the 3 citizens in the "Available Citizens" section over into the "Citizens Aboard" section.
   1. The game will not let you load any of the citizens onto the transport and it will not tell you why not.

I recommend creating an error message that tells the player why they cannot load a citizen onto the transport.