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Can scoreboard tags affect entity despawning? I checked the wiki, but there is no mention of it. Logically, it seems like the answer would be no, because they just classify/identify entities, but name-tagging an entity makes it despawn-proof, so maybe tags do too? Just wanting to be sure.

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The only NBT-tag that affects mob despawning is the PersistenceRequired-tag, a custom name does NOT change this behaviour.

This command summons a renamed zombie that will despawn:

/summon minecraft:zombie ~ ~ ~ {CustomName:'{"text":"zombie"}'}

This command summons a renamed zombie that will not despawn:

/summon minecraft:zombie ~ ~ ~ {CustomName:'{"text":"zombie"}',PersistenceRequired:1b}

Changing the name of a zombie with a name tag will change both the name and set the PersistenceRequired-tag to 1.

If a zombie picks up an item, then the PersistenceRequired-tag will be set to 1.
Credits go to Fabian Röling for mentioning this in the comments

In conclusion, using this command will not make the nearest zombie despawn-proof:

/tag @e[type=minecraft:zombie,sort=nearest,limit=1] add zombie

Note: I only tested wether or not a zombie despawns in those cases, it may be possible that they take longer to despawn, or despawn quicker, or that they are affected in some other way.

Note 2: I only tested this with zombies, but it should apply to any entity

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    Maybe you also want to write somewhere in your answer that picking up items and nametagging sets PersistenceRequired to true.
    – Fabian Röling
    Commented Aug 3, 2019 at 12:07
  • @FabianRöling I did mention the nametagging ("Changing the name of an entity with a name tag will change both the name and set the PersistenceRequired-tag to 1.") and I haven't tested about picking up items, I will test that and add it to the answer.
    – user232393
    Commented Aug 3, 2019 at 12:17
  • @FabianRöling Items don't have the PersistenceRequired-tag, neither before picking them up, nor after dropping them. Can you please elaborate on what you mean?
    – user232393
    Commented Aug 3, 2019 at 12:20
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    @FabianRöling I figured it out and tested it, I will add it to the answer now
    – user232393
    Commented Aug 3, 2019 at 12:27
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    @Nik3141 You can set the PersistenceRequired-tag to 1 to make sure they won't despawn, I'm assuming that you know how to do that, so I leave it at that.
    – user232393
    Commented Aug 3, 2019 at 17:09

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