Bug: Dragons reset their health to max during combat

I had this problem with both the Hinterlands dragon and the Exhalted Plains dragon.

Somewhere around getting them down to 25-30% health they reset to full again. There was not an issue of me leaving the arena in some way.

For the Hinterlands dragon, it was during one of the parts where it takes off and changes position.

For the Exhalted Plains it was during a time when the dragon jumps a short distance. During this it became invisible, but materialized after progressing the time.

I am on PS4 and both of these happened when using the tactical mode. Would be pretty annoying if it happened when fighting one of the more high level dragons!