This field is marked in red and does not allow saving, but however through the terminal everything is fine
also and this
What version of WinBox?
Are you running the latest version?
WinBox v3 is in the legacy section.
You need to use WinBox v4 for those new added fields, MikroTik decided to not make them compatible with WinBox v3 for some reason.
3.43 last version