The grave isn't showing for bedrock player (no model nor any text, just barrier block), even thought I did make necessary changes to the config from this comment: #99 (comment)

This is my config:

  "model": {
    "default": "corpse_player",
    "alternative": [
		{
			"require": {},
			"model": "default"
		},
		{
			"require": {},
			"model": "soul"
		}
	],
	  "enable_geyser_workaround": true,
    "hide_f3_debug_lines": false,
    "gravestone_item_base": "minecraft:skeleton_skull"

I can provide the full config if needed.

You need to remove alternatives, as it is picking them up instead. Alternative just selects how grave block looks after player dies, allowing state-dependent grave models (like terraria ones!).

It works now! Through I still like the default one. Why it doesn't work?

Because geyser doesn't support display entities correctly

I see, will close issue now.

How do you remove the alternative im having the same problem.

You just delete anything in the "alternative": []

Is this still working as of 1.21.3? I followed everything shown here.
it likes to delete the geyser workaround line every time I restart the server after attempting to edit the config.
I have gotten the text lines to work on bedrock just no models

The geyser workaround is not avaliable now, you just have to put corpse_player as the model.