Player constantly switch between being on the ground and in midair when in bed

The Bug:

Discovered while testing MC-190551 and MC-198256.

When a player enters a bed, they constantly switch between being on the ground and in midair. The value of OnGround changing between 1b and 0b confirms this.

Steps to Reproduce:

1. Put the following commands into two repeating command blocks:

   title @a[nbt={OnGround:1b}] actionbar {"text":"On Ground"} 

   title @a[nbt={OnGround:0b}] actionbar {"text":"Midair"} 

2. Set the time to night with the following command:

   /time set night
   

3. Place a bed and enter it.
   The OnGround is continuously changing between 1b and 0b.

Observed Behavior:

The player is constantly switching between being on the ground and in midair when in a bed.

Expected Behavior:

The player stays either on ground or in midair when in a bed.