[iOS][Swift5] Can't find template files

Description

If I'll indicate a custom folder with template files for code generation, it will throw a file not found exception, more details bellow

Swagger-codegen version

3.0.26

Command line used for generation

swagger-codegen generate -i https://docs.helloreco.holiday/swagger/support.yaml -t handlebars -l swift5 -o TestOutput/

The handlebars is a folder located in /Users/username/Documents/project-ios/RecoSwaggerClient with this structure:

-- handlebars
     -- swift5
          -- model.mustache
          -- ... other mustache files

Result after running the command in /Users/username/Documents/project-ios/RecoSwaggerClient

13:42:18.248 [Thread-0] INFO  i.s.c.v.i.CodegenIgnoreProcessor - No .swagger-codegen-ignore file found.
Exception in thread "Thread-0" java.lang.RuntimeException: Could not generate model 'ApiErrorResponse'
	at io.swagger.codegen.v3.DefaultGenerator.generateModels(DefaultGenerator.java:451)
	at io.swagger.codegen.v3.DefaultGenerator.generate(DefaultGenerator.java:779)
	at io.swagger.codegen.v3.cli.cmd.Generate.run(Generate.java:378)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.io.FileNotFoundException: /Users/username/Documents/project-ios/RecoSwaggerClient/handlebars/handlebars/swift5/model.mustache
	at com.github.jknack.handlebars.io.URLTemplateLoader.sourceAt(URLTemplateLoader.java:70)
	at com.github.jknack.handlebars.Handlebars.compile(Handlebars.java:438)
	at com.github.jknack.handlebars.Handlebars.compile(Handlebars.java:419)
	at io.swagger.codegen.v3.templates.HandlebarTemplateEngine.getHandlebars(HandlebarTemplateEngine.java:52)
	at io.swagger.codegen.v3.templates.HandlebarTemplateEngine.getRendered(HandlebarTemplateEngine.java:25)
	at io.swagger.codegen.v3.DefaultGenerator.processTemplateToFile(DefaultGenerator.java:795)
	at io.swagger.codegen.v3.DefaultGenerator.generateModels(DefaultGenerator.java:438)
	... 3 more

I had previously installed version 3.0.24 and all was working as expected, after updating to 3.0.24 I am having this error. It seems that it's trying to find the templates not directly in the indicated folder (from -t param).
As well if I'll indicate another folder for -t param, let's say templates, it seems to use default templates and ignore the ones from fodler.

Reproduce the reported command with swagger-codegen 3.0.26 and compare it with 3.0.24. Start at DefaultGenerator.java and templates/HandlebarTemplateEngine.java, following the stack trace through Generate.run.java and URLTemplateLoader. Done means a custom -t directory is not duplicated in the lookup path and an alternate template directory is used instead of the defaults.