fix(l2): replace ticker with sleep in dev-mode block producer

[avilagaston9]

Motivation

Our L2 integration tests sometimes fail with the following error:

 2025-11-25T14:51:56.997348Z ERROR Failed to produce block: error sending engine_forkchoiceUpdatedV3 with PayloadAttributes: Invalid forkchoice state: "invalid timestamp"

I have found two issues:

• tick() only ensures that some interval has passed since the previous tick() call, so the first tick() finish immediately.
• Given that we use a block_production_interval_ms of 1 sec, it is possible for two consecutive forkchoice messages to have the same timestamp.

Description

• Replaces tick() with sleep() .

Closes None

[Copilot]

Pull request overview

This PR fixes intermittent L2 integration test failures caused by timestamp collisions in the dev-mode block producer. The fix replaces tokio::time::interval with tokio::time::sleep to ensure consistent timing between block production cycles.

Key Changes:

• Replaced ticker.tick().await with sleep(Duration::from_millis(block_production_interval_ms)).await to guarantee full intervals between operations
• Updated comments to reflect the new sleep-based approach

Comments suppressed due to low confidence (1)

crates/blockchain/dev/block_producer.rs:25

• The tries counter is only incremented on errors (lines 54, 77, 111, 123), but not after successful block production. This means the loop will run indefinitely if blocks are produced successfully, ignoring the max_tries limit. Consider incrementing tries at the end of each successful iteration or restructuring the loop to properly handle both success and failure cases.

    while tries < max_tries {

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Lines of code report

Total lines added: 0
Total lines removed: 1
Total lines changed: 1

Detailed view

+------------------------------------------------+-------+------+
| File                                           | Lines | Diff |
+------------------------------------------------+-------+------+
| ethrex/crates/blockchain/dev/block_producer.rs | 120   | -1   |
+------------------------------------------------+-------+------+