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**What type of PR is this?** Feature + Bugfix **What does this PR do? Why is it needed?** Starting at Fusaka, the beacon node can pull blobs with the `engine_getBlobsV2` API from the execution layer. This reduces by a lot the burden on the beacon node. However, the beacon node should be able to work 100% correctly without this execution layer help. This PR introduces the `--disable-get-blobs-v2` flag to simulate a 0% success rate of this engine API. This PR also fixes: - https://github.com/OffchainLabs/prysm/issues/16171 Please read commit by commit with commit messages. **How to test it:** For the `--disable-get-blobs-v2` part: Run the beacon node with the `--disable-get-blobs-v2` flag in DEBUG mode. For every block with commitments, the following log should be displayed: ``` [2025-12-19 15:36:25.49] DEBUG sync: No data column sidecars constructed from the execution client ... ``` And the following log should **never** be displayed: ``` [2026-01-05 10:19:00.55] DEBUG sync: Constructed data column sidecars from the execution client count=... ``` For the #16171 part: - No ERROR log showed in the linked issue should never be displayed. **Acknowledgements** - [x] I have read [CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md). - [x] I have included a uniquely named [changelog fragment file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd). - [x] I have added a description with sufficient context for reviewers to understand this PR. - [x] I have tested that my changes work as expected and I added a testing plan to the PR description (if applicable).