How did Hezekiah have such wealth (2K 20) after surrendering so much to the Assyrians (2K 18)?

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Sennacherib attacked Judah. To placate the Assyrian king in 2K 18:

15 Hezekiah gave him all the silver that was found in the house of the LORD and in the treasuries of the royal palace. 16 At that time, Hezekiah stripped the gold from the doors of the temple of the LORD and from the doorposts that he had overlaid, and gave it to the king of Assyria.

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But then, only two chapters later, Hezekiah showed his great wealth to the Babylonian envoys in 2K 20:

13 Hezekiah welcomed them, and he showed them all his treasure house, the silver, the gold, the spices, the precious oil, his armory, all that was found in his storehouses. There was nothing in his house or in all his realm that Hezekiah did not show them.

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This raises the question: How did Hezekiah have such wealth after surrendering so much to the Assyrians?
Let's see what happened between those two events. After Hezekiah gave the gold and silver to Sennacherib, he didn't leave him alone:

17 The king of Assyria sent the Tartan, the Rab-saris, and the Rabshakeh with a great army from Lachish to King Hezekiah at Jerusalem.

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Sennacherib wanted more; he wanted to take over Jerusalem. The Rabshakeh said to the people,

31 "Do not listen to Hezekiah, for thus says the king of Assyria: ‘Make your peace with me and come out to me."

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Hezekiah didn't want to surrender, but you people could.

36 But the people were silent and answered him not a word, for the king’s command was, “Do not answer him.”

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People in Jerusalem didn't surrender. Some days later, 2K 19:

35 That night the angel of the Lord went out and struck down 185,000 in the camp of the Assyrians. And when people arose early in the morning, behold, these were all dead bodies. 36 Then Sennacherib king of Assyria departed and went home and lived at Nineveh.

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Sennacherib left Hezekiah alone and he left in a hurry because of the angel of the Lord. Hezekiah collected the spoils. It might even include the gold and silver that Hezekiah gave to Sennacherib. Then Hezekiah became proud. Later in 2K 20:

12 King of Babylon, sent envoys with letters and a present to Hezekiah, for he heard that Hezekiah had been sick. 13 And Hezekiah welcomed them, and he showed them all his treasure house, the silver, the gold, the spices, the precious oil, his armory, all that was found in his storehouses. There was nothing in his house or in all his realm that Hezekiah did not show them.

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How did Hezekiah have such wealth (2K 20) after surrendering so much to the Assyrians (2K 18)?
He might have gotten them all back after the Angel of the Lord struck the Assyrians.