Igniting TNT with redstone fails

Before reading: I read all of the posts about tnt redstone block and redstone igniting tnt, and this post may contain duplicated elements, but I have explonation for them, and I list the most redstone problems w tnt.
Description:
TNT with redstone block: If placing down a redstone block and a TNT beside it it will blow... But if placing down the TNT first and then the redstone block the TNT will stay in block form until it gets a block update from one of the side. If "powering" the redstone block by placing a redstone or a redstone torch next to it will update the block and ignite the tnt, but simply updating the TNT will ignite it.
TNT with redstone torch: Now the same thing with it, by placing down a redstone torch and then the TNT will ignite it but if placing down the TNT and then the torch it will NOT ignite it. NOTE: Redstone torch won't activate tnt only if gamerule is set to doTileDrops=False. Redstone block with doTileDrops=false/true will still glitch.
What I expected to happen: They will ignite the TNT...