Why can't clients ping the server?

The game still works but the ping indicator always shows a red dot. I've seen the meaningful ping number one or two times, but it almost always shows a red dot.

Is this a bedrock bug or is there something wrong with my setup?

No file, test, or entry point is identified in the issue. Start by reproducing the red ping indicator and determining whether the behavior comes from the Bedrock server or the local setup; done means identifying the cause and documenting a reproducible fix or configuration change.

Written by the indexing model from the issue text.