Two options.. If you have a 3 valve bypass. all 3 may be closed, (Two should be open for hot water)
If you have a 1 or 2 valve system (And sometimes on 3) there is a check valve on the hot water outlet.. IT may be stuck closed, I have seen this with my own eyes.
The RVer who owned that rig fixed it two ways
1: Gutted the valve thus restoring full hot water flow,, Since they wintereize by the dry method they did not need the check valve anyway.
2: Traded the trailer in on a very nice new one.
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Home is where I park it!
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