This is probably not a powerlevel9k issue but I figured this would be the best place to start since someone may have an answer. I have recently installed powerlevel9k on 3 different computers. I am using Kayant's config as a starting point and like it so far. I am using SourceCodePro+Powerline+Awesome+Regular since it seemed popular. The problem is with the Awesome powerline icons. This happens on all 3 computers exactly the same. I am running Manjaro/KDE on all three and using Konsole as my primary terminal emulator. I have tried playing with every appearance setting I could find within Konsole but could not get this behavior to stop. I decided to try another terminal emulator (Terminator) and the font seemed fine there. I thought maybe it only affected Qt emulators so I downloaded QTerminal and I had the exact same issue as with Konsole. Weirdly enough the folder icon (outside of home folder) is fine but the other two are cut off. I know as a workaround I could disable these icons but I kind of like them so would rather get it fixed if anyone has any ideas.

Hey man, the solution : https://github.com/bhilburn/powerlevel9k/issues/231
Ha! Thanks @D4v2z for finding that solution. I completely forgot about it.
Btw. I did a quick research this morning and found out that Konsole has some issues regarding double-width glyphs. Hard to say what other terminal emulators do different. The information that a glyph needs to be printed as double-width is coded somewhere in the font I guess..
Perfect! Thank you. This is exactly the kind of workaround I was looking for. I must have been searching the wrong key words. Following the example I also added entries for my other cut-off icons:
POWERLEVEL9K_HOME_SUB_ICON=$'\UE18D '
POWERLEVEL9K_FOLDER_ICON=$'\uE818 '
Using this page as reference:
https://github.com/bhilburn/powerlevel9k/blob/master/functions/icons.zsh
Btw. , Just for completeness, easier than looking into functions/icons. zsh would have been to call get_icon_names. ;)
Hi, I did this but no home icon is being displayed, just a square. :(

@millsoft It seems that your font does not support all Icons. Which font do you use?
Btw. sorry for the late response.
Hi @dritter
I use mostly the fonts Cousine and Overpass Mono which come from Nerd Fonts Complete
Same issue on latest KDE neon 5.15
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Same issue on latest KDE neon 5.15