When I join the Minecraft server from a Bedrock device via Geyser and floodgate, I find this error in the console:
The method hasPermission is not supported for temporary players. (thrown in a PacketAdapter#onPacketSending method from my plugin)

Is it possible to make temporary players more like normal players? PacketInterceptors are like EventListeners with wider possibilities and I'd really like to use functions like Player#hasPermission within.
Related to 225 but this was 5 years ago already

I'm using the development version of ProtocolLib already.

We pretty much only use temporary players when they're absolutely required as-is. There have been attempts in the past to expand this, but it didn't really work.

This is still happening.

This is still happening.

Did you read the response of project author?