[Bug?] Placing a pixel resets the 30-second countdown timer

Example: I have 1 pixel in my bucket, and am due to receive another pixel in 5 seconds.

If I wait the 5 seconds, I can place 2 pixels.

However, if I place the 1 pixel from my bucket before the 5 seconds elapse, the countdown resets to 30 seconds, which I must wait until receiving the next pixel.

Is this the intended behaviour?

I would expect the behaviour to be "receive a pixel every 30 seconds that your bucket is not full", but the current behaviour seems to be "receive a pixel every 30 seconds that you do not place a pixel and your bucket is not full".