Created attachment 1193165 [details] fedora-25-20160822-tibetan-displays-as-replacement-characters.png I used Fedora-Workstation-netinst-x86_64-25-20160822.n.0.iso See attached screenshot.
We seem to have these 2 fonts available supporting Tibetan: mfabian@ari:~ $ fc-list :lang=bo family file lang | grep -v mfabian /usr/share/fonts/tibetan-machine-uni/TibMachUni-1.901b.ttf: Tibetan Machine Uni:lang=aa|ast|ay|bi|bo|br|bs|ch|co|cs|da|de|dz|en|es|et|eu|fi|fj|fo|fr|fur|fy|gd|gl|gv|ho|hr|hu|ia|id|ie|io|is|it|ki|lb|lt|lv|mg|mh|mt|nb|nds|nl|nn|no|nr|nso|oc|om|pl|pt|rm|shs|sk|sl|sma|smj|so|sq|ss|st|sv|sw|tk|tl|tn|tr|ts|uz|vo|vot|wa|wen|xh|yap|zu|an|crh|csb|fil|hsb|ht|jv|kj|ku-tr|kwm|li|ms|na|ng|pap-an|pap-aw|rn|rw|sc|sg|sn|su|ty|za /usr/share/fonts/jomolhari/Jomolhari-alpha3c-0605331.ttf: Jomolhari:lang=aa|ast|ay|bi|bo|br|ch|co|da|de|dz|en|es|et|eu|fi|fj|fo|fr|fur|fy|gd|gl|gv|ho|ia|id|ie|io|is|it|lb|mg|nb|nds|nl|nn|no|nr|nso|oc|om|pt|rm|shs|sma|smj|so|sq|ss|st|sv|sw|tl|tn|ts|uz|vo|vot|wa|xh|yap|zu|an|fil|ht|jv|kj|kwm|li|ms|ng|pap-an|pap-aw|rn|rw|sc|sg|sn|su|za mfabian@ari:~ $
The problem still exists in Fedora-Workstation-netinst-x86_64-25-Alpha-1.2.iso
The problem still exists in Fedora-Workstation-netinst-x86_64-25-20161003.n.0.iso
*** This bug has been marked as a duplicate of bug 1370118 ***