HoI 4 - Soviet Supply is broken, supply AI tries to route everything by ship even when ships don't exist but trains do [windows], [1.11.13.886b], [d17

[Overestimate]

Description of issue
Soviet Supply is broken, supply AI tries to route everything by ship even when ships don't exist but trains do [windows], [1.11.13.886b], [d173]

Game Version
[1.11.13.886b], [d173]

Enabled DLC
Together for Victory, Death or Dishonor, Waking the Tiger, Man The Guns, La Resistance, No Step Back

Do you have mods enabled?
No

Description
When you load up a new soviet game, you are chronically undersupplied - this means that you cannot trade, etc. The main driver of this is the fact that all supply routes are trying to send supplies by sea using non-existent convoys - this is even though rail connection exists and trains are in oversupply. This means that supplies are not going to be transferred.

You can manually fix this by fully blocking sea zones (baltic) from convoy usage, however the way the system behaves speaks of some underlying deep derping with the supply AI resource management. It seems that it defaults to sea transport 100% of the time, even when transport resources for that don't exist.

Steps to Reproduce
Start a game with the USSR. Supply is low. Block convoys from using the Baltic and watch your supply creep back to 100% like magic.

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[tmorrow911]

I think eveyrone's supply is messed up. I have the German merchant fleet shipping supplies through the English Channel to occupied France rather than just overland. I am losing 10-15 convoys a day running supplies that should be aboard my copious supply of trains. It is so strange how supply always seems to come back up as a challenge. Supply was horrific in HOI 3, but they seemed to get it mostly right when 4 first came out, now it is messed up again. Paradox for Pete's sake, just fix the supply and let players manage convoys! It is kind of ridiculous that I cannot just shut off a convoy route.