Funds not trapped after polkadotXcm.Attempted returns FailedToTransactAsset

[Juanma0x]

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• This is not a support question.

Description of bug

The XCM extrinxic 6353817-2 in Kusama Asset Hub resulted in an Attempted FailedToTransactAsset error because the account tried to transfer all transferable funds.

Due to the limitations of the new delivery fees manager, the funds should have been trapped but were instead just withdrawn.

Related:
#690
#3434
#3450

This could impact the total issuance.

Steps to reproduce

No response

[Juanma0x]

I'll add another case that might be affected by the same bug:

Transactions failed in Polkado Asset Hub:
https://assethub-polkadot.subscan.io/xcm_message/polkadot-57b7063a03798764c36226132fae6145f7b150b4

• The account sent USDC from Acala to PHA using the Acala bridge. No issues:
  https://acala.subscan.io/extrinsic/5876246-2

• Polkadot Relay Chain processed the message:
  https://polkadot.subscan.io/extrinsic/20146096-1?event=20146096-3

• Polkadot Asset Hub generated the event xcmpqueue (Fail):
  https://assethub-polkadot.subscan.io/extrinsic/5971079-0?event=5971079-1

I don't see any "trapped" balance. The sender account had enough to pay for the fees in ACA, and some DOT (0.016 DOT) were transferred to pay for the destination fee.

According to Joe, 0.016 DOT were not enough and the balance dropped below the ED.