Bitcoin Node stuck at starting after upgrading to Umbrel v1.3

From what I can see in your log, the node tries to start but shows the same error several times:

bitcoin_bitcoind_1 | 2024-12-24T13:52:11Z [error] txindex: best block of the index not found. Please rebuild the index.

Here is a guide to do it:

It is a process that will take some time depending on your hardware.