Being under a boat, while pushed up by a geyser or wind charges, kicks player from server for flying

Description

Being under a boat, while pushed up by wind charges or geyser, kicks player from server for flying.

Steps to reproduce

Run a 26.3 vanilla server locally with the official server.jar, make sure allow-flight is set to false, and join it.

Geyser:

• Build a geyser with lava, potent sulfur and water

• Put a boat in it, so it gets pushed up by the geyser

• Change to survival mode (if is not on survival mode)

• Get into the geyser, stay under the boat, and wait a few seconds

Wind charge:

• Enter this command in a repeat command block:
  summon minecraft:wind_charge ~ ~0.6 ~ {Motion: [0, -10, 0]}

• Build a small platform several blocks above the command block
  /tp yourself on the center of the command block

• Stay still and summon any boat on the platform:
  /summon minecraft:acacia_boat ~ ~10 ~

• Change to survival mode (if is not on survival mode)

• Destroy the platform without moving, make the boat falling on you

• Launch the command block, and wait a few seconds

This video shows the reproduction steps, and test starts at 02:05. (Constantly having issue uploading it as an attachment, sorry)

Expected result

Not to get kicked.

Actual result

Kicked for Flying is not allowed on this server!