[Molang][error]-Error: accesing a variable that doesn't currently exist in this entity: variable.originz"

I go into the nether, along a bridge, and go into my other portal, and then there are constant error messages saying "[Molang][error]-Error: accesing a variable that doesn't currently exist in this entity: variable.originz" or, less often, it says "[Molang][error]-Error: unhandled request for unknown variable _'variable.originz'_

 

(The [Molang] is what it actually says )