is this true ?
I don't understand what you mean, can you explain please ?
For a new bar to start there has to be a tick during the period for the bar, for example, the midday H1 bar starts at 12:00:00 and runs to 12:59:59 the Bid price at the first tick during this time is the Open price. If that first tick was due to the Ask price changing then the Open for this bar will be the same as the Close price of the previous bar, 11am H1 bar. If the tick was as a result of the Bid price moving by 10 pips then the Open of the midday bar will be 10 pips difference compared to the Close of the 11am bar.