Riding an entity causes damage when the "maxEntityCramming" gamerule is set to 1

The Bug:

Riding an entity causes damage when the "maxEntityCramming" gamerule is set to 1.

Steps to Reproduce:

1. Set the "maxEntityCramming" gamerule to 1 by using the command provided below.

   /gamerule maxEntityCramming 1

2. Summon a pig and equip it with a saddle.
3. Enter survival mode and mount the pig.

Observed Behavior:

Riding an entity causes damage.

Expected Behavior:

Riding an entity would not cause damage.