stat.walkOneCm Increases While Standing Still

Process:
1. Open inventory.
2. Leave minecraft window
3. Copy stats file from .minecraft/saves/[save]/[id].json
4. Wait ~5 minutes (without touching the minecraft window)
5. Copy stats file again.

The two copies of the stats files are attached, along with the output of git diff between a json-formatted version of them (see a0db92bf-formatted.diff attachment). Also included is a screenshot and debug-screenshot.

NOTE in the diff that while stat.playOneMinute and stat.timeSinceDeath have changed as expected, stat.walkOneCm has increased by 14,701 cm, even though the player could not have moved!