Ignition - On-screen keyboard - backspace key - Ubuntu 20.04.2 LTS

I’m running ignition Perspective 8.1.7 session on Ubuntu 20.04.2 LTS Panel PC using on screen keyboard. In Ignition the backspace button does not work when using the on screen keyboard. Using the regular keyboard is working. The on Screen keyboard backspace key is working fine in other apps running on the OS.