The profile name "Built-in" is not localised, and it looks rather awkward as an English string among the other localised messages. This one should be marked as translatable as well.
As far as I can tell it tries to localize the name, but I guess it fails because of the intermediate variable
A possibly relevant merge request was started @ https://invent.kde.org/utilities/konsole/-/merge_requests/886
Git commit 7b54cc9cd96b32d9170904f3fa065bd785397b04 by Kurt Hindenburg, on behalf of Nicolas Fella. Committed on 31/08/2023 at 01:58. Pushed by hindenburg into branch 'master'. Fix translating the builtin profile name Having the name in a separate variable breaks extracting the translations M +2 -7 src/profile/Profile.cpp https://invent.kde.org/utilities/konsole/-/commit/7b54cc9cd96b32d9170904f3fa065bd785397b04