The income received by the etf from the bonds is distributed twice a year. There isn’t another distribution until June; the last one was in December. Other than that there is no entitlement to the bond income that isn’t due to be distributed yet, but the price of the etf will have moved partly due to the approaching of the next dividend, i.e. tending to go up to reflect that another distribution is due sooner. It may not be obvious because other things can affect the net asset value and hence the price as well. (The bond prices can go up and down in the market.) Hope this explains.