Can't interact with hints

I'm on KDE (Kubuntu 24.04). After installing and triggering `hints`, I'm seeing the labels at the right places, but when I type letters shown on labels nothing happens (no clicks, and the labels don't go away and don't react to typing in any way). I've tried adding the accessibility variables from the README to `/etc/environment` and rebooting, but nothing changed. I've tried switching backends as well - it changes the way labels are detected, but doesn't affect my issue. When running `hints` from shell, I immediately see this:

```
(hints:7743): dbind-WARNING **: 12:55:38.828: AT-SPI: Unable to open bus connection: Failed to connect to socket /run/user/1000/at-spi2-PUTVZ2/socket: No such file or directory
```

Please let me know where else I can find information needed to debug this.