TL;DR After dash Titus and Oz were at the same square.

Detailed description (maybe some detail will help to reproduce this bug):
Today I've seen how Titus's dash target moved away and Titus landed on Oz's clone. Oz swapped with this clone at the same time. As a result, both Titus and Oz were standing on one square. Heal pick up that was on the same square was taken by Oz.

Unfortunately, I forgot to report it in-game.