CLI Text Cursor disappears when PROMPT_INDICATOR is set to empty string

[theAkito]

Describe the bug

Blinking cursor disappears.

How to reproduce

1. Edit env.nu.
2. Change PROMPT_INDICATOR from { "〉" } to { "" }.
3. Append \n\n to the string in create_left_prompt.
4. Save file & source env.nu.
5. Notice how there is no blinking cursor on the CLI prompt, anymore.
6. It only appears after adding characters in any way.

Expected behavior

Blinking cursor should continue to appear.

Screenshots

No response

Configuration

key	value
version	0.70.0
branch
commit_hash	9ef65dcd692b502d7476b1787247fae8638c2f0c
build_os	linux-x86_64
build_target	x86_64-unknown-linux-gnu
rust_version	rustc 1.64.0 (a55dd71d5 2022-09-19)
rust_channel	stable-x86_64-unknown-linux-gnu
cargo_version	cargo 1.64.0 (387270bc7 2022-09-16)
pkg_version	0.70.0
build_time	2022-10-18 18:52:28 +00:00
build_rust_channel	release
features	database, dataframe, default, trash, which, zip
installed_plugins

Additional context

Platform Debian GNU/Linux 11 (bullseye) in WSL2 on Windows 10

Terminal software Windows Terminal

Apparently setting PROMPT_INDICATOR to { "\n\n" }, instead of the string in create_left_prompt, works around this issue. Although, this workaround creates a different issue. Doing it like this will duplicate the prompt line, when returning an empty string or just pressing arrow up.