Is there an existing issue for this?

• I have searched the existing issues.

Are you using the latest MineColonies Version?

• I am running the latest beta/release version of MineColonies for my Minecraft version.
  I am also running the latest versions of other mods that are part of my problem.

Did you check on the Wiki? or ask on Discord?

• I checked the MineColonies Wiki and made sure my issue is not covered there. Or I was sent from discord to open an issue here.

What were you playing at the time? Were you able to reproduce it in both settings?

• Single Player
• Multi Player

Minecraft Version

1.20

MineColonies Version

1.20.1-1.1.903

Structurize Version

1.20.1-1.0.772

Related Mods and their Versions

Forge 47.4.0

Current Behavior

When placing the Town Hall with the build tool the advancement does not trigger.
If you pick up the TH and re-place it with the build tool after starting the colony the advancement will trigger

Expected Behavior

For the advancement to trigger when placing the TH the first time, before you start the colony.

Reproduction Steps

Place TH and start colony
Pick up TH and place it again
Get advancement for placing it.

Logs

Don't have any at this time

Anything else?

I have observed this many times and have heard others discuss that the advancement only triggers if you move the TH. I suspect the trigger is relying on a colony being established, which it shouldn't need to.

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This advancement is only supposed to trigger when the building actually gets built, by a builder, after starting the colony.

If you paste the building, start the colony, then it doesn't trigger because the colony never existed prior to already putting down the building.
This method you described is also a developer/creative way of setting up a colony, this isn't intended to be the "natural flow" of how to do things, so it doesn't count.

There's two advancements.
There's "the centerpiece" which triggers when the townhall is built.
And "start your colony" which triggers (or is supposed to) when you initially place your townhall hutblock.
The second one is the one that isn't working right.
place townhall to start colony, nothing happens.
Use "pickup" in build options to place townhall hutblock back down, "start your colony" triggers

Where did I describe creative pasting in this issue? The reproduction steps are how we do it in survival.
Talyda covers it above. As the title says: the advancement for placing the Town Hall is bugged.

Found and fixed in #11084