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. Snapshot can be selected from the dropdown menu.
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Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Minecraft Wither NBT Data Tags
Using the summon command to spawn in a minecraft wither is simple, take the command and enter into chat and presto you have a wither.
How to summon a Wither with invulnerability.
Withers have an invulnerability timer when summoned, this counts down at 20 ticks per second.
/summon minecraft:wither ~ ~ ~ {Invul:1200} (Invulnerability for 60 seconds)
/summon minecraft:wither ~ ~ ~ {Invul:6000} (Invulnerability for 5 minutes)
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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.
