Bedwars TNT glass problem

[Zackwall]

I'm trying to create a TNT just like the one in Hypixel bedwars the problem is that when I place TNT on top of a glass and below the glass is wool or any other explodable block the block would break, in Hypixel bedwars that's not the case. could anyone help me?

here's my code:

on explosion:
    cancel event
    create a safe explosion of force 3.8 at event-location
    loop exploded blocks:
        if loop-block is not glass or any bed:
            set loop-block to air
        if loop-block is TNT:
            set loop-block to air
            spawn a primed TNT at the loop-block's location
            push last spawned entity direction from event-location to last spawned entity with force 1