Zagg Slim Book iPad Pro keyboard arrows issue

There's an issue with Zagg's Bluetooth keyboard on iPad Pro 12.9 - while arrow keys working as expected in, say, Prompt terminal, it's not the same for Blink. I have a feeling it's sending wrong codes, and it's more similar to PgUp/PgDown behavour. I'm sorry if the issue is a dup and already known. Let me know if you'll need more details or I can help somehow.