Parameters FabricVariablesClient and FabricLakehouseClient in one udf function

I've dug more into this and identified a very weird behaviour. If I use FabricSQLConnection together with the FabricLakehouseClient it works. However If I use the FabricVariablesClient together with any of them, that is not working and throwing exactly the same internal error.

import fabric.functions as fn

udf = fn.UserDataFunctions()


@udf.connection(argName="variables", alias="varlib")
@udf.function()
def this_works(variables: fn.FabricVariablesClient )-> str:    
    return variables.getVariables()["x"]


@udf.connection(argName="variables", alias="varlib")
@udf.connection(argName="myWarehouse", alias="fabWH")
@udf.function()
def this_fails(variables: fn.FabricVariablesClient, myWarehouse: fn.FabricSqlConnection, )-> str:    
    return variables.getVariables()["x"]


@udf.connection(argName="variables", alias="varlib")
@udf.connection(argName="myLakehouse", alias="fablakehouse")
@udf.function()
def this_fails_too(variables: fn.FabricVariablesClient, myLakehouse: fn.FabricLakehouseClient, )-> str:    
    return variables.getVariables()["x"]