We have the wiki code:
{{Comment|5 миллионов [[Баррель (американский нефтяной)|баррелей]]|795 000 кубических метров}}
Which renders:
<span class="ts-comment-commentedText" title="795 000 кубических метров">5 миллионов <a href="/wiki/%D0%91%D0%B0%D1%80%D1%80%D0%B5%D0%BB%D1%8C_(%D0%B0%D0%BC%D0%B5%D1%80%D0%B8%D0%BA%D0%B0%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D0%BD%D0%B5%D1%84%D1%82%D1%8F%D0%BD%D0%BE%D0%B9)" title="Баррель (американский нефтяной)">баррелей</a></span>
span node as a proper title attribute.
Desktop Parsoid render does it right as well:
https://ru.wikipedia.org/api/rest_v1/page/html/%D0%92%D0%B7%D1%80%D1%8B%D0%B2_%D0%BD%D0%B5%D1%84%D1%82%D1%8F%D0%BD%D0%BE%D0%B9_%D0%BF%D0%BB%D0%B0%D1%82%D1%84%D0%BE%D1%80%D0%BC%D1%8B_Deepwater_Horizon
But Parsoid Mobile does not:
https://ru.wikipedia.org/api/rest_v1/page/mobile-sections-lead/%D0%92%D0%B7%D1%80%D1%8B%D0%B2_%D0%BD%D0%B5%D1%84%D1%82%D1%8F%D0%BD%D0%BE%D0%B9_%D0%BF%D0%BB%D0%B0%D1%82%D1%84%D0%BE%D1%80%D0%BC%D1%8B_Deepwater_Horizon
which gives something like:
<span class="ts-comment-commentedText">5 миллионов <a href="/wiki/Баррель_(американский_нефтяной)" title="Баррель (американский нефтяной)">баррелей</a></span>
The title attribute has disappeared and it should not IMO.
Maybe this is a feature, but then class="ts-comment-commentedText" should be removed as well.
Report first at https://github.com/openzim/mwoffliner/issues/1132