Minecraft Realms: Configure / Players / Player Activity: hover-over play time shows many1-minute slices instead of the whole session

The display of play times (start/end and duration) for players in the Player Activity screen of the Realms configuration console has recently changed.

Previously the hover-over information was shown as a single block of time. Now it is broken into many small units - mostly right down to 1 minute - stacked one above the other. See the attached image for details.