For example, note in the search results that Tifcha is rendered correctly in Isa 40:17, but appears as a "dot" in Isa 29:11. Similarly, Mercha is rendered correctly in 1Sa 12:21, but appears as a "dot" in Isa 40:23.

Cantillation also has rendering issues in the right-click context menu.

You also see a rendering issue in various guides. Note that the word in the exegetical guide is rendered differently from what is shown in the popup.

7.12 (7.12.0.0027) on macOS 10.13.2 (17C205)