My embarked units have movement speed of 2 despite several movement bonuses that should apply (Lighthouse wonder, Norsemen culture).

1. I have the "Trade Expedition" tech research unlocked, which provides the 2-speed naval transport

2. I have switched culture to Norsemen, with the 3-speed Langskip which should be used instead as the naval transport for embarked land units

[Edit: This is my mistake, I didnt yet research the tech for Langskip at that point. Points 3 and 4 still appy though - the embarked unit now has a speed of 3, while I would expect a higher value].

3. The Norsemen cultural trait is Stormborn: "+3 Naval Movement Speed on Naval Unit". I would expect that to apply to the naval transport ships.

4. I have a constructed Lighthouse of Alexandria wonder, which provides +2 Naval Movement Speed on Naval Unit. I would expect that also to apply to naval transport ships.

Screenshot and save file attached.

Norsemen Turn 73 - NoEmbarkedSpeedBuff.ctr