transactions – How Does the Blockchain Acknowledge Locked UTXOs in a PSBT if the PSBT Is not Saved On-Chain?

I am at the moment exploring using Partially Signed Bitcoin Transactions (PSBTs) and have a query concerning the locking mechanism of UTXOs throughout the signing course of. I perceive that as a primary signer, I lock UTXOs to make sure they aren’t utilized in one other transaction earlier than the PSBT is finalized. Nevertheless, because the PSBT itself will not be saved on the blockchain till it is absolutely signed and broadcast as a whole transaction, how does the blockchain or the community acknowledge that these UTXOs are locked? Does the lock really replicate on the blockchain, or is it managed another method?

I’m on the lookout for clarification on:

The mechanism that forestalls different events from utilizing the locked UTXOs whereas the PSBT is in progress.
Any documentation or technical particulars that designate how these locks are acknowledged and revered by the community.
Any insights or technical explanations can be vastly appreciated!