When you use the minecraft:friction component in custom blocks it's expected that high friction values make you go slow like soul sand and honey blocks. However, it does the opposite and makes you go super speed!

The value used in the video demonstration and gametest pack is 0.9, which is the value that's expected of soul sand-like behaviour as recommended by the blockbench block wizard.

The provided gametest pack was made for 1.20.30 and requires the Beta APIs. Run the command "/gametest run bugreport:highfriction" to run the test.