Market On Open isn't accurate

Expected Behavior

Market on open should mimic the official open price for the day when subscribing to regular data feed (such as minute) as outlined here
https://www.quantconnect.com/docs/v2/writing-algorithms/trading-and-orders/order-types/market-on-open-orders

Actual Behavior

this backtest isnt actually producing any results as described in the article.
as well i have noticed on other backtests that when subscribing to minute data the qc takes the 2nd bar after the open (the bar of 09:32 and not and not 09:31 as outlined in your article... )

Potential Solution

might be related to this:

For MOO, official opening price is only used in the Tick branch: EquityFillModel.cs (line 458) looks for OfficialOpen | OpeningPrints.
But our algo subscribes to minute TradeBars, so LEAN uses this branch instead: EquityFillModel.cs (line 503). That branch literally does:

_var tradeBar = asset.Cache.GetData<TradeBar>();
fill.FillPrice = tradeBar.Open;_

at line 505 (line 505) and line 518 (line 518).
So yes: with minute bars, QC MOO can fill from the cached minute bar Open, not the official daily open. If the cached bar is the 09:31-09:32 bar, the report shows 09:32 and price matches 09:31 open.

Reproducing the Problem

create a backtest with subscribing to minute data and do some MOO, see that trade prices are not the daily open prices.

System Information

QC CLoud

Checklist

• I have completely filled out this template
• I have confirmed that this issue exists on the current master branch
• I have confirmed that this is not a duplicate issue by searching issues

• I have provided detailed steps to reproduce the issue

Start with EquityFillModel.cs, especially the Tick and TradeBar branches cited in the report, and reproduce the behavior with a minute-data backtest containing market-on-open orders. Check how the cached TradeBar and official opening price are selected, then add or update focused tests so the fill uses the expected daily open and the reported timing is corrected.