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 Bat NBT Data Tags
Using the summon command to spawn in a minecraft bat is simple, take the command and enter into chat and presto you have a bat. Bats can not be tamed or bred. They are passive ambient mobs.
How to summon hanging Bat
The nbt data tag BatFlags:1 sets the bat into hanging mode, this only works if the bat is summoned underneath a block and the block is a regular (non-transparent) block. If the space in invalid or not the summon command, then the bat will fly off.
/summon minecraft:bat ~ ~ ~ {BatFlags:1}To stop the bat flying away use the NoAI:1 tag, which prevents all mob movement.
/summon minecraft:bat ~ ~ ~ {BatFlags:1,NoAI:1}
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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.