Some player won't transfer at the date set in future transfer.
I set 4 future transfers at will be joining to my club at 1-July-2019, but when 1st of July, only 2 players joined and the other 2 players did not joining.
Please refer to attachment for more details:
1st attachment : future transfer screenshot
2nd attachment: Calendar is showing those players join at 1st of July
3rd attachment: 2 players successfully transferred and another 2 players pending transfer in transfer center
4th attachment: Buffon profile still showing joining arsenal at 1st of July, but actually the day are already 2nd of July
FM version: 20.4.3-1441365 (m.e v2040)
FMRTE version: 20.4.3 (build 46)