[Jeffers24]

Is it have "first-char-wakeup-sends-bad-code" behavior as [MX3-M], so that it needs to push button twice after sleep?

I have not noticed any problems.

If I wake the remote up by pressing the cursor key the cursor appears on the screen and if I move the remote the cursor moves as expected.

If I wake the remote by pressing the return key the expected action happens.

So I only press a button once and the expected action happens.

Hope this helps, if there is anything specific you want me to test, provide step by step instructions and how I can detect a bad key and I will do it and let you know what happens.