The "Summon Leng Spiders" random trait doesn't display

The random scenario trait to summon Leng Spiders when fighting other monsters (the deck 6 analog to Charging Ogres, etc.) does not display its strings.

During the preview, the box for this trait simply doesn't appear.

During the game, the effect display shows it, but it is named the same as the scenario and shows an empty text box when tapped.

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Android 7.0 on Nvidia Shield tablet K1

PFID#EC19BBE1B715AFA6

Legendary difficulty, seen in multiple scenarios