fzf-tab: [BUG] Cursor moves up on failed completion

In some environments, when I press tab and there is no valid completion, the cursor moves upwards.

This is a recording demonstrating the problems: https://asciinema.org/a/PlF3DoOIeIQQRwpG40K2o5cpw In this recording, I first ssh into a Raspberry pi. Some parts of the prompt looks broken because I use Nerd Fonts glyphs, which work fine for me, but it seems asciinema doesn’t understand them. I first try some working competions, then I try to complete fjdkls, which is invalid, and when I press tab, the problem occurs: “no matches for files” is correctly displayed but the cursor moves upward, and when I press tab again the cursor moves up again, also other text also moves upwards, erasing the text that was there.

Environment:

• OS: Raspbian GNU/Linux 9 (stretch)
• zsh version: 5.3.1 (arm-unknown-linux-gnueabihf)

uname -a
Linux alternative-pi-hole 4.19.66-v7+ #1253 SMP Thu Aug 15 11:49:46 BST 2019 armv7l GNU/Linux

The problem only occurs when I combine three things:

1. Raspbian 9 (I can’t reproduce it on Raspbian 10)
2. When I use fzf-tab (if I remove that, completion works fine)
3. When I use the prompt Powerlevel10k with two lines (it does not happen with one line powerlevel10k prompt).