/execute unless entity @p run command does not execute when entity is killed

/execute unless entity @p run sub command 

When command is entered from a command block it will not execute the sub command when entity test succeeds 

 

Steps to Reproduce: (see screenshot)

1. Set up two scoreboards using the following commands:

/scoreboard objectives add kills dummy

/Scoreboard objectives add killsdisplay dummy

/Scoreboard objectives setdisplay list

2. Set up two chains of command blocks facing up three blocks from each other, with an observer facing out from your impulse command followed by a piece of redstone dust and a comparator facing the opposite direction 

First chain:

Impulse Unconditional Needs Redstone 

/Scoreboard objectives remove killsdisplay

Chain Unconditional Always Active

/Scoreboard objectives add killsdisplay dummy kills

Chain Unconditional Always Active

/Scoreboard objectives setdisplay list killsdisplay

Second chain:

Repeat Unconditional Always Active

/Testfor @a

Chain Conditional Always Active

/Scoreboard players add @a kills 0

Chain Conditional Always Active

/Execute at @a run scoreboard players operation @p killsdisplay= @p kills

3.One last chain of command blocks:

Repeat Unconditional Always Active

/Testfor @e[tag=Wave1]

Repeat Conditional Always Active Delay in Ticks: 1

/Execute unless entity @e[tag=Wave1] run scoreboard players add @p kills 1

4. Tag a singular entity with /tag @e[r=1] add Wave1

5. Kill entity 

Observed Results:

The scoreboard should increase by 1 for whomever was nearest the final command block chain and yet it does not. This was working prior to the 1.20.71 &1.20.72 hotfixes. Upon further inspection, any /execute unless entity @p run subcommand command does not run when the entity or entities specified are killed