Perhaps this is the way some radios were repaired a long time ago, when cost was a factor. Could have been cheaper to bypass a stage than to charge the customer for a more complete repair.
I don't know why your set was not functioning in that one stage, but what component could have been unrepairablem ebough to bypass a stage?
Unless it was in the RF section where an open or shorted coil was unavailable"
Anyhow, good luck!
Gary.