Resizing window leaves random characters in the prompt

On iPadOS 13.4.1, I noticed that resizing the a-shell window will leave some random characters in the prompt.

Here’s some sample input that was put into the prompt from collapsing / expanding the onscreen keyboard a few times:

[M tQ[M#tQ[M vP[M#vP[M uQ[M#uQ[M uM[M#uM[M O4[M#O4

I’m not sure what this is - perhaps control characters for the terminal size changing?