That might be the case, yes. For I remember I have once set fire to the floor to burn animals but I extinguished them afterwards. Same case for the Nether, I extinguished the fire on a block but when I stepped on it, I was set on fire.
I can’t show a video about it because I’m playing on Nintendo Switch, which unfortunately cannot film a video of the gameplay. As for the template, I’m not quite sure what it means as I have made my issue very clear in the description. Thanks.
Also, I’m not sure about the ‘placing blocks makes the fire reappear’ scenario because I haven’t encountered it again since and I can’t test it out.