Minecraft 1.20.5 has changed syntax on many commands, so most commands will no longer work without an update.
An update is in progress, you can check compatibility progress here.
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Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Minecraft Vex NBT Data Tags
Using the summon command to spawn in a minecraft vex is simple, take the command and enter into chat and presto you have a vex. Vexs have are bound to a location and will wander a 5×11×15 cuboid range centered at coordinates BoundX, BoundY, BoundZ.
Preventing a Vex from taken LifeTick damage
A Vex will eventually despawn due to life loss from constant LifeTicks life damage cycle. LifeTicks decreasing by 1 per tick. On reaching zero, the vex takes damage and LifeTicks is set to 20. In this example the Vex will live quite a long time before the cycle begins.
/summon minecraft:vex ~ ~ ~ {LifeTicks:100000}Suggestions or found a bug
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If you're looking for a particular summon mob generator you can link to these specific versions of the command generator.