v4.91
I sent my whole TG to overhaul. When the main ship was finished and told me so in the events, I erroneously assumed that the whole group was finished, so I went to the TG page, found the group in question and got them to start their fleet training.
They've been zipping all over the inner Sol system for a while, when I finally decided to give them some orders. I was told I cannot order ships undergoing overhaul. It turns out that the escort ships were not finished with their overhaul yet. But, since they started zooming around with the main ship, they were accruing time on their clock. So, I had several ships, stuck in the middle of space, unable to be given orders because they are stuck in "overhaul" mode, but still accruing clock time. I sort of fixed it as best as I could with SM mode (SM moved to Earth and then told to cancel overhaul).
But this brings up a bigger problem. Sending a TG to fleet training seems to not follow the regular checks that any other order would follow. So your TG can end up doing things it should not be doing, automatically.
Oh, and I think that ships undergoing fleet training are also ignoring conditional orders. So they will run themselves out of fuel, even if they have conditional orders to refuel when low.