Fire not being put out in the nether when the block below it is destroyed

For the past two weeks when I have been playing Minecraft I have been mining in the nether for ancient debris using beds. And the netherack would light on fire. When I mine the block below the fire it shows the fire go out but when I jump up on the block below the block that was on fire I start taking fire damage from invisible fire. Then in order for me to put it out I need to place the blocks where they were and hit the fire out before breaking the block again.