What Happens to These Semi-anual Gaps for IHYG.L?

(please see the image below)
For IHYG.L, there are vertical gaps EXACTLY every half a year, why?
I thought stockcharts.com always adjusted prices for dividends/splits.
Is this an exception?

Thanks.

0s_Vv7Y9Ruq4_lboe3k0dA.png
 
It is normal for bonds to have a sawtooth price chart. When interest is paid, prices drop. Then, prices recover as time passes to come near to the next interest payment day. This gives the price chart a sawtooth look over time.

I don't think it is correct for bonds to adjust for interest payment. I don't know what is standard practice, though.
 
Stockcharts.com says they have already adjusted for the dividends. For example, the chart for HYG is smooth without such semi-annual gaps.
I am wondering why IHYG.L is not handled correctly.
 
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