2 added 12 characters in body
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Yes, it will revert back at 0 HP

The clause for true polymorph ending is:

The transformation lasts for the duration, or until the target drops to 0 hit points or dies.

Since the duration is now permanentlasts until dispelled due to concentrating on the spell for the full duration, it won't revert after one hour. The duration part has been resolved.

But it doesn't remove the clause regarding target dropping to 0HP or death. That still remains as there is nothing that specifically overrides that.

The only piece overriden is the one hour duration.

Because of that, once the creature who was under the spell effect (but long past one hour) gets to 0HP or dies, they will revert back.

Yes, it will revert back at 0 HP

The clause for true polymorph ending is:

The transformation lasts for the duration, or until the target drops to 0 hit points or dies.

Since the duration is now permanent due to concentrating on the spell for the full duration, it won't revert after one hour. The duration part has been resolved.

But it doesn't remove the clause regarding target dropping to 0HP or death. That still remains as there is nothing that specifically overrides that.

The only piece overriden is the one hour duration.

Because of that, once the creature who was under the spell effect (but long past one hour) gets to 0HP or dies, they will revert back.

Yes, it will revert back at 0 HP

The clause for true polymorph ending is:

The transformation lasts for the duration, or until the target drops to 0 hit points or dies.

Since the duration is now lasts until dispelled due to concentrating on the spell for the full duration, it won't revert after one hour. The duration part has been resolved.

But it doesn't remove the clause regarding target dropping to 0HP or death. That still remains as there is nothing that specifically overrides that.

The only piece overriden is the one hour duration.

Because of that, once the creature who was under the spell effect (but long past one hour) gets to 0HP or dies, they will revert back.

1
source | link

Yes, it will revert back at 0 HP

The clause for true polymorph ending is:

The transformation lasts for the duration, or until the target drops to 0 hit points or dies.

Since the duration is now permanent due to concentrating on the spell for the full duration, it won't revert after one hour. The duration part has been resolved.

But it doesn't remove the clause regarding target dropping to 0HP or death. That still remains as there is nothing that specifically overrides that.

The only piece overriden is the one hour duration.

Because of that, once the creature who was under the spell effect (but long past one hour) gets to 0HP or dies, they will revert back.