ProgressView Output is Erratic

[13r0ck]

Distribution (run cat /etc/os-release):

NAME="Pop!_OS"
VERSION="21.10"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 21.10"
VERSION_ID="21.10"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=impish
UBUNTU_CODENAME=impish
LOGO=distributor-logo-pop-os

Related Application and/or Package Version (run apt policy $PACKAGE NAME):

pop-installer:
  Installed: (none)
  Candidate: 0.0.1~1625837472~21.10~d70babe
  Version table:
     0.0.1~1625837472~21.10~d70babe 1001
       1001 http://apt.pop-os.org/release impish/main amd64 Packages

Issue/Bug Description:

Shown steps are:
1a. (0%)
2a. (0%)(100%)
3a. "Partitioning Drive"
4a. "Extracting Files"
5a. "Configuring the System"
6a. "Finishing the Installation"

I assume 1a-2a are "performing Backup Step", but that text is never displayed, As well, rather than clearing the line before showing "100%", that text is appended to the end of the line.

Pictures below:
1a.

2a. (This shows for about 7 seconds on a Adder2)

3a. (expected behavior)

(4a-6a are expected behavior and are not shown.)

Steps to reproduce (if you know):
Install Pop!_OS

Tested in a few languages on both 21.10 and 21.04

Expected behavior:
According to src/Views/ProgressView.vala the Installer should show steps with a appended percentage
1b. "Perform Backup Step"
2b. "Partitioning Drive"
3b. "Extracting Files"
4b. "Configuring the System"
5b. "Finishing the Installation"