Namey

When trying to place a combatant at the start of combat, nothing happens and the battle menu just disappears

https://imgur.com/a/JZX79zt

gamingislove

Hm, my first guess would be that there is no combatant in the player group - or maybe no alive combatant ...

Try adding Unity Console nodes to your Player Grid Placement node to see if it results in Success or Failed.

Namey

https://imgur.com/krqwzub
The log says the placement failed

gamingislove

And I assume this happens immediatley, so there's no player input?

That sounds like there are no deployment cells available in the grid.

Or there's no grid registered with the battle system, though you set that at the start. Is this battle starting in the same scene or e.g. after a scene load? If after loading into the scene, try adding a Wait node at the start (before setting the grid).

Namey

The menu to select combatants for placement appears, and the grid placement failure happens when the player clicks on one of the combatant buttons.

Here is what deployment cell settings look like:
https://imgur.com/a/WSLoFZu

Edit: I changed the settings on the Set Battle Grid node to "Defined Grid" instead of "Nearest Grid," and now it works

Namey

Hang on, now as soon as the battle starts, all the player combatants are automatically placed on the enemy side, the placement is considered to be failed, and all the combatants are instantly upgraded to maximum level

gamingislove

If they're instanstly max level, that hints at a not correctly set up status development, e.g. not having an exp curve.

As for the player placed on enemy deployment cells - better check (or show me) the deployment setup for those cells.

Namey

Here is the deployment setup:
https://imgur.com/a/WSLoFZu

gamingislove

Setup seems correct.
The only way this causes the player to be placed on the enemy deployment cells is if the player is an enemy of the player ... I assume you don't do any faction or group changes before the battle starts that could cause something like this?

I think I'll need a Unity test project to investigate.

Namey

I sent it over