FYI, some here are hand waving against the new values for H0. ...
There is a real problem with measuring H0 using the CMB to support inflation and LCDM and comparing H0 values determined by other methods in astronomy today. The Hubble time is very different too as I showed, even using the flat universe model. This is the real problem in cosmology when it comes to different values reported for H0, this has been a problem since the days of Edwin Hubble.
Ah, I was intending to respodn to this earlier but run out of time. First, since I know you are interested in a putative "missing mass" problem of forming solar system, a new work points to a reasonable physics - planets generally forms within one million year, so observing older disks will see a deficit which already went into planets.
"Baby planets are born exceptionally fast, study suggests Planets are forming around young stars far faster than scientists expected, arising in a cosmic eye blink of less than half a million years, according to a new study. That finding could inform models of planet formation and help resolve a problem plaguing astronomers since 2018, when data indicated that planetary nurseries contained far too little material to actually create planets."
"To find out how much material is available for planet formation, researchers have used the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile to weigh the disks around young stars between 1 million and 3 million years old. Past studies found that some lacked the mass to form even a single Jupiter-size world. The results suggested astronomers were either overlooking some hidden reservoir of material or they were looking too late in the planet-forging process, after growing protoplanets had already vacuumed up much of the material.
The answer, says Łukasz Tychoniec, a graduate student at Leiden Observatory and lead author of the new paper, is that “we need to look earlier instead of [looking] for missing mass.”
Along with his colleagues, Tychoniec used images from ALMA and the Very Large Array (VLA) in New Mexico to study 77 protostars ..."
The planet formation time is not many orders of magnitude away from the rapid formation times proposed to predict the characteristics observed for smaller outer system bodies in the new “hot start” scenario [ https://www.universetoday.com/14665...-slowly-freezing-solid-for-billions-of-years/
Second, I'm not sure what you mean with "new values" since all mentioned values is within the usual span, nor what you mean with "this has been a problem" since the expansion rate closed in the 90s - earlier values differed with a factor 2 - only to recently diverge in some observations.
See my comment on how the most precise measurements now see the low-z values in some measurements go away when adding data and types of observations.
To add to that, it has now been shown that the modern tension can equally well be a tension in the cosmic background spectra temperature. And here again the tension goes away with measuring the temperature and/or relying on high-z observations
Same as the temperature, the expansion time is connected to how you make these observations.