Non-Player Entities Fail to Generate New Nether Portals in Unlinked Dimensions

Description:
When there is no linked Nether portal in the corresponding coordinates of the other dimension, non-player entities (e.g., mobs, minecarts, boats) cannot pass through an active Nether portal in the Overworld to generate a new portal in the Nether. This behavior differs from both older Bedrock versions (pre-1.19.10) and Java Edition, where entities could trigger portal generation upon entry.

How to Reproduce:

1. Create a new world and do not visit the Nether.

2. Build a Nether portal in the Overworld.

3. Attempt to send a non-player entity (e.g., a mob, minecart with a passenger) through the portal.

4. Observe whether the entity is teleported and whether a new portal generates in the Nether.

Observed Result:

• Non-player entities remain inside the Overworld portal frame without being teleported.

• No new Nether portal is generated at the corresponding coordinates in the Nether.

• Only player traversal successfully creates a new linked portal in the Nether.

Expected Result:

• Non-player entities should pass through the portal and trigger the generation of a new Nether portal in the corresponding coordinates, consistent with Java Edition and pre-1.19.10 Bedrock behavior.

Additional Notes:

• This regression since Bedrock 1.19.10 significantly impacts Nether-based transportation systems (e.g., villager trading halls, mob farms).

• Java Edition maintains the correct behavior, suggesting this is an unintended change in Bedrock.

• Urgent restoration of legacy functionality is requested for gameplay consistency.