I created a scoreboard objective tied with time_since_rest stat to reset the insomnia timer but when i reset it to 0 phantoms are still spawning. It may effect earlier versions as I have only just stumbled across it

Recreation:

1. Create world

2. Run /scoreboard objectives add rest minecraft.custom:minecraft.time_since_rest

3. Let the world run until phantoms start spawning

4. Run /kill @e[type=phantom]

5. Run scoreboard players reset @a rest

Wait till night if its not night all ready and you will see that after 1 or 2 minutes phantoms still spawn even with the time_since_rest is well below 72000