When using an imported user-defined functions that calls other udf and uses ternary ifs, deployment fails

[GABRIELNGBTUC]

Bicep version
Bicep CLI version 0.23.1 (b02de2d)
Describe the bug
When using imported user-defined functions calling other functions that are not explicitly imported in the import statement. It seems that the deployment can fail if the nested functions are being used inside a ternary if and that they are not imported

To Reproduce

main.bicep

import {getSubnetNumber, isWindows} from 'types.bicep'

param plan_name string = 'plan-name-001'

var subnet_number = getSubnetNumber(plan_name)

var formatted_subnet_name = '${isWindows(plan_name)}${subnet_number}'

output out string = formatted_subnet_name

types.bicep

@export()
func getPlanNumber(hostingPlanName string) string => substring(hostingPlanName, length(hostingPlanName) - 3)

@export()
func isFirstPlan(planNumber string) bool => planNumber == '001'

@export()
func isOneLeadingZero(planNumber string) bool => substring(planNumber, 0, 1) == '0'

@export()
func isTwoLeadingZeroes(planNumber string) bool => substring(planNumber, 0, 2) == '00'

@export()
func getSubnetNumber(plan_name string) string => isFirstPlan(getPlanNumber(plan_name)) ? '' : (isTwoLeadingZeroes(getPlanNumber(plan_name)) ? substring(getPlanNumber(plan_name), 2, 1) : (isOneLeadingZero(getPlanNumber(plan_name)) ? substring(getPlanNumber(plan_name), 1, 2) : getPlanNumber(plan_name)) ) 

@export()
func isWindows(hostingPlanName string) string => contains('-windows-', hostingPlanName) ? 'ASPWindows' : 'ASP'

When attempting a deployment with the provided main.bicep, the deployment fails with the error:

{"code": "InvalidTemplate", "message": "Deployment template validation failed: 'The template function '__bicep.getPlanNumber' is not found. Please see https://aka.ms/arm-syntax-functions for usage details.'.", "additionalInfo": [{"type": "TemplateViolation", "info": {"lineNumber": 97, "linePosition": 406, "path": "properties.template.functions[1].members.getSubnetNumber.output.value"}}]} 

if you modify the import statement to import all functions that are used by getSubnetNumber and isWindows, attempting to deploy the template will then succeed.

//main.bicep
import {getSubnetNumber, isWindows, getPlanNumber, isFirstPlan, isOneLeadingZero, isTwoLeadingZeroes} from 'test.module.types.bicep'

param plan_name string = 'plan-name-001'

var subnet_number = getSubnetNumber(plan_name)

var formatted_subnet_name = '${isWindows(plan_name)}${subnet_number}'

output out string = formatted_subnet_name

Both templates compile with the build command but only the last works in a deployment.

Additional context
The reason I believe the issue is linked to the ternary if is because I do not get the issue when nesting functions directly

Example:

@export()
func a(input) => b(input)
func b(input) => c(input)
func c(input) => uniqueString(input)

In this situation, calling a(input) does not cause any issues.

[jeskew]

Thanks for reporting! This should be addressed in the next release.