When I right click on a report tab all text is missing for the options to "Rename page", "Delete page" or "Duplicate page".
This happened after I had created a new report tab and moved that tab to be positioned first in my report. The issue also remains for that specific report after it's been published and I use the report from Power BI Service.
However this has so far only happened to one specifc report and I cannot seem to reproduce the issue on any other reports right now.