"NBT+" is only added to "Lore" when you use the "pick block" button while holding CTRL for any tile entity. You would need to manually insert it if you're using commands to create items with tile data.
Your command does not need all the data you've provided it, and should especially avoid using UUIDLeast and UUIDMost unless absolutely needed (in which case, you have be to absolutely sure not to have more than one entity with the same UUID). Altered command:
I messed around with whisper, and made it do stuff that's unexpected, but it says no "NBT+"
summon Item ~ ~1 ~ {Motion:[0:0.0d,1:-0.0d,2:0.0010663853842281519d],UUIDLeast:-5099925178493624566L,Health:5s,Invulnerable:0b,Air:300s,OnGround:1b,Dimension:0,PortalCooldown:0,Rotation:[0:90.097145f,1:0.0f],Thrower:"Asteroid100",FallDistance:0.0f,Item:{id:"minecraft:command_block",Count:1b,tag:{BlockEntityTag:{CustomName:"Notch",Command:"tell @p \"Be warned...\"",id:"Control",SuccessCount:0,TrackOutput:1b},display:{Lore:[0:"Activate!!!"]}},Damage:0s},UUIDMost:6062901623132538722L,Pos:[0:57.875d,1:63.0d,2:7.874267776692828d],PickupDelay:0s,Fire:-1s,Age:-13s}
"NBT+" is only added to "Lore" when you use the "pick block" button while holding CTRL for any tile entity. You would need to manually insert it if you're using commands to create items with tile data.
Your command does not need all the data you've provided it, and should especially avoid using UUIDLeast and UUIDMost unless absolutely needed (in which case, you have be to absolutely sure not to have more than one entity with the same UUID). Altered command:
Minecraft-things: http://skylinerw.com
More Minecraft-things: https://sourceblock.net
Guides for command-related features (eventually moving to Source Block): https://github.com/skylinerw/guides
I primarily hang out in the /r/MinecraftCommands discord, where there's a lot of people that help with commands: https://discord.gg/QAFXFtZ
Their corresponding subreddit: https://www.reddit.com/r/MinecraftCommands/