Pure Maps: cannot select text-to-speech engine

I have installed espeak and mimic as tts engines. However, in the settings of pure maps it shows that no engine is installed. Is that a sanboxing issue?

New release is out and warns all Jolla Store users that this is an issue. As a workaround, please install from Chum. Note, as stated in Pure Maps OpenRepos page, I am currently updating my packages in Chum and Jolla Store only.