MAESTRY POINTS FORZA HORIZON 4

There is a support article at the FH4 forums that might help you: https://support.forzamotorsport.net/hc/en-us/articles/360023134993-FH4-Release-Notes-May-15th-2019

Two point hospital. Train simulator. Forza horizon 4.

The repair kids bikes.

Forza Horizon 5 does NOT have any announced or planned cross-progression from Forza Horizon 4. Aside from Forza Horizon 1 (which did had loyalty rewards for Forza Motorsport titles), there has never been cross-progression for Forza Horizon titles. You always had to start fresh with each game.

And about Forza Horizon 4: the lack of possibility to use the same save between Steam and Microsoft Store comes from the technical point of the each game. Both use a wholly different methods of saving which is far too much work to make them co-operate, ESPECIALLY considering that Forza Horizon 4 is way past its' prime.

See here for the features of Forza Horizon 4:

https://www.xbox.com/games/forza-horizon-4

driveable tanks in Forza Horizon 4 would make the Forza Horizon series into a new game(it would no longer be a Forza Horizon game).