Graves can become an 'issue' as people's circumstances change. I keep an eye on one for someone who lives on the other side of the planet. It took a long time to find it, initially. Three visits and a bit more location information before I finally stumbled on it.
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Four or five quick visits over the last couple of years and it has progressed a bit.
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The glass 'gravel' was retrieved from the layer of 'mulch' that had been delivered by the strimmers over the years.
It was strimmed again, a couple of weeks after the last picture above and, as I suspected, they made much more effort to avoid flinging debris in, now that it looks a bit 'kept'. It only took a minute to remove 95% of it.
It is worth considering the future logistics.