Scenario: A creeper is ignited with flint and steel or commands. Using the /data command, their ignited nbt tag is set to 0b. Then, the data command is used to determine the value of the creepers ignited nbt tag.

Expected Outcome: SInce the ignited nbt was manually set to 0b, its value should be 0b.

What Actually Happened: The ignited nbt tag is still equal to 1b.

I have tested and confirmed this. I attached a gif showing this behaviour. Also, for reference, there are NO other creepers in the world I tested, and I made sure of that. The doMobSpawning gamerule is set to false.