Prior to recent updates the way the plugin checked what was strictly "below" you for the death blocks. Now it also checks what block you are "inside" of, which means you can have water as a death block but still be safe walking on a lillypad, similar for stairs and the death block below them.

Add a configuration option to allow for "old" type of detection for those that prefer how it worked before. An example is placing carpets and it would trigger a death when walking on a carpet with a death block beneath.

This has been achieved by adding a new config option "Other.ParkourKit.LegacyGroundDetection", once enabled it will only detect the block directly below the player and not if the player is "inside" a block.