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In a classical AC system you would have NO parts which are below freezing...
You have a line near the compressor cold enough to make ice...
so the Txvalve... more specifically the siphoning throttle valve part of it was certainly suspect since that is supposed to keep the evaporator from getting below freezing so that ice will not form from the humidity in the air passing across the fins of the evaporator and Stopping air flow....
but here you seem to have it warmer at the exit of the evaporator ... than at the downstream fitting at the compressor... Since the theory is that changing the liquid at the TXvalve to spray into the evaporator is what allows heat to be absorbed from the warm air flowing across the fins... something is clearly wrong.
There is not a physics theory which would allow it to get colder after exiting the evaporator while going along that line to the inlet side of the compressor...
So I am hoping your method of measuring the temp at the exit line of the evaporator is not giving true results... otherwise I am totally out of ' theory ' ....
If on the other hand... your evaporator is dirty enough to keep the warm air from the car from taking away enough cold to operate the exit side of the txvalve... then it is possible for properly cold fluid to exit the evaporator .... along with the possibility the txvalve is not functioning properly.... and the line be below freezing at the inlet to the compressor...
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