[MC-123410] Marker armor stand cannot find itself with 0 as distance selector argument

Marker armor stands cannot find themselves when a value of 0 is used as distance selector argument value.

Summon a non-marker armor stand

/summon armor_stand ~ ~ ~ {Tags:["non_marker"]}

Have the armor stand use a distance=0 selector

/execute as @e[type=armor_stand,tag=non_marker] at @s run say @s[distance=0]

Summon a marker armor stand
```
/summon armor_stand ~ ~ ~ {Marker:1b,Tags:["marker"]}
```
✔ The armor stand finds itself as expected
Have the armor stand use a distance=0 selector
```
/execute as @e[type=armor_stand,tag=marker] at @s run say @s[distance=0]
```
❌ The armor stand does not find itself

Linked issues

migrated 2018-01-16T19:15:04Z

This is not a duplicate of MC-88533 because this also affects area_effect_clouds!

Summon an aec

/summon area_effect_cloud ~ ~ ~ {CustomName:"\"statsTest\"",Duration:2147483647}

Print all entities that are not within radius 0 of themselfs:
```
/execute as @e at @s unless entity @e[distance=0] run say @s
```

migrated 2018-01-16T21:22:44Z

@@unknown: please create a new ticket for AECs.