It seems like 1.20 has brought back this particular issue: https://hub.spigotmc.org/jira/browse/SPIGOT-1646
Player.getLocation() is updated before the PlayerMoveEvent fires, thus, calling the former during an event will reflect the PlayerMoveEvent.getTo() location instead of the getFrom() one, like it did prior to the 1.20 update.
This breaks all plugins that rely on the old logic (from=loc).

The attachments below show the legacy behavior and the new one, for a comparison.
For convenience, the plugin attached to the old issue was used.