Manuel

Gracias muy amable. Gracias por su atención

Can confirm for 1.13-pre1

Also you can't use a carrot on a stick if you're in the adventure mode and watching on a block.

Yes, it is

They are set to minimal

I tried it again and now it does work for me too. Thanks anyway

I placed two command blocks. The first was a repeating always active one and the second was a chain always active one. In the repeating command block i wrote the command

execute as @a[scores={resDeath=1..}] at @s run setblock ~ ~ ~ diamond_block

execute as @a[scores={resDeath=1..}] at @s run setblock ~ ~ ~ diamond_block

and in the chain command block i wrote the command

execute as @a[scores={resDeath=1..}] run scoreboard players set @s resDeath 0

execute as @a[scores={resDeath=1..}] run scoreboard players set @s resDeath 0

. The objective named resDeath I created with the command scoreboard objectives add resDeath minecraft.custom:minecraft.deaths.