When I die and one or more Universal Graves exist, holding my items. I can no longer use the way stones. Clicking a way stone will open the interface. But upon selecting a destination, the UI closes, leaving me where I was. Other way stone operations, like breaking, placing, renaming a way stone all work. And I can add new way stones to my network. I just cannot travel via way stone until all my graves are broken. This makes it very difficult to return to my grave!

1. Do you have the requirements for the teleportation (items, xp, levels or whatever you have it set to)
2. Does anything appear in the console/log file when the waystone closes?

I didn't think there were any requirements, but upon checking the config files, that might be my problem:

This is my waystones/config.json file:

{
  "generate_in_villages": true,
  "consume_infinite_knowledge_scroll_on_use": false,
  "can_owners_redeem_payments": false,
  "cost_amount": 1,
  "cost_type": "level",
  "cost_item": "minecraft:ender_pearl",
  "waystone_block_hardness": 4,
  "waystone_block_required_mining_level": 1.0,
  "recipes": {  /* cut for brevity */  }
}

So far, all my way stones are in the Overworld - most due to spawning in villages. One from crafting. And some due to a duplication bug when an update caused all the way stones to be waterlogged (and I broke them with a Tech Reborn basic drill, which only broke half the way stone (but each half gave me a whole way stone when I picked them up). I've not tried breaking a water logged way stone since water logged fix.

Should I close the issue?

Yes, you can close it.
I reset the config file after deliberately letting myself get killed, I could still use the way stones.

  "cost_amount": 0,
  "cost_type": "",