Description of problem:
When booting RHEL 8.4 ISO and using the boot: menu line wraps are not handled properly, and show as if there is a carriage return when there is not. Additionally, using backspace causes the console to refresh and show a whole separate line instead of simply removing the character off of the existing line

Version-Release number of selected component (if applicable):
RHEL 8.4

How reproducible:
Always

Steps to Reproduce:
For carriage return issue:
1. Boot system with RHEL 8.4 ISO
2. Press "escape" in order to get to the "boot:" menu
3. Hit a single character and continue to hold, eventually it will cause the system to show as if a carriage return was entered. This seems to usually happen shortly after hitting the end of screen and returning to the start

For the backspace issue:
1. Follow steps from carriage return issue above
2. Hit backspace, note that every time backspace is hit the screen refreshes and shows an entirely new entry

Actual results:
Display issues are seen, though they do not actually affect functionality. Even when the carriage return is displayed, there is not truly a carriage return, and functionality is normal. 

Expected results:
There are no fake carriage returns displayed, and backspace is handled properly within the same line instead of doing a full refresh on the console with a new line

Additional info:
Issue is not present on RHEL 7

I'm aware that this may not be an issue in anaconda necessarily, and could be an issue in ISOLINUX directly, but I don't see that as an available component. 

This has been reproduced thus far on kvm, as well as on vmware, so it is not yet confirmed if the issue is hit on all hardware. 

The functionality is not affected, and in all instances the boot: menu is still able to function normally to boot a system as expected, but this behavior does cause confusion when attempting to add parameters.