I found that there is a lag while looking at the output of smc.bos_choch(df, swing_hl).
Also, the resulting dataframe would not show the Levels until it was Broken. Is this a limitation of the approach used to calculate swing highs and lows? @joshyattridge @CosmicTrader

Example:

Without the BrokenIndex, I do not see corresponding Level:

With BrokenIndex included, I see the Level: