[Autocomplete Issues] Autocomplete Dropdown disappears for no reason and autocomplete does no longer add braces

The first issue I am facing is that the autocomplete dropdown is no longer consistent. It looks like it only shows up every other key stroke.

The second thing I noticed is that whenever I auto complete a method it no longer adds braces and simply leaves you with method names. I expect params.add() in this case when pressing tab.

Both of these problems occured a few weeks / month ago and it's really annoying to code like this. Anyone else experiencing these issues? It really brings down the excellent experience I had with Intellij in the past.

I use Ubuntu 24.04.3 LTS with Wayland.
It looks like this is a 2026.1 issue. A downgrade to 2025.3.4 resolved it.