Indeed it works well on my testing (image attached); GNOME Terminal's custom font option is disabled (so it is using the default font), and Ubuntu Mono is still used in GNOME Tweaks, and still the GNOME Terminal now uses Monospace font by default, making the first problem solved.
Thank you Gunnar, for the help!
Indeed it works well on my testing (image attached); GNOME Terminal's custom font option is disabled (so it is using the default font), and Ubuntu Mono is still used in GNOME Tweaks, and still the GNOME Terminal now uses Monospace font by default, making the first problem solved.
Thanks again for the help.
Best.