Piping data via STDIN into executable makes text prompts not work

Issue
As soon as I populate the STDIN pipe to my program with any data, the text prompts won't work properly.

Context
I have a binary that does text processing (https://github.com/replicadse/complate).
In the past, the configuration for the template was loaded via a configuration file. I have added a feature with which one should be able to pipe the configuration string directly into the print command.

Behaviour

dialoguer::Input::new().allow_empty(false).with_prompt("some text").interact()

When specifying allow_empty(false), the terminal flickers and shows weird behaviour. I can not enter text nor can I do anything else than Ctrl+C exit.
When specifying allow_empty(true), the data result string is empty.

References
Here you can see me reading the data from STDIN:
https://github.com/replicadse/complate/pull/10/files#diff-c5354523dab7ee14c84278715c952cb7e302af46f5c8372b94375b36f003b93eR138
Here you can see me using dialoguer:
https://github.com/replicadse/complate/blob/master/src/render/mod.rs#L174

Start by reproducing the interaction described with dialoguer::Input and piped STDIN, using the complate references to understand how STDIN is consumed before the prompt at src/render/mod.rs:174. Inspect the console input and terminal handling involved, then verify that piped data remains available while interactive text prompts accept input normally.