The missing value for Chipset temperature is due to a bug in the BIOS, which was most probably introduced in the new update.
Yes, OHM shows this value because it accesses the SIO chip (IT8665E) directly and this is a problem on 3xx/4xx series ASUS boards. There has been a lot of discussion about it on this forum. Result is - accessing the SIO directly can cause corruption of the SIO registers, which can result in a system crash, malfunction of fan control, inability to shut down the system, etc.
Hence ASUS made a WMI interface available to solve this problem and you can see that HWiNFO is using this.
So I don't recommend to use software that's not using the WMI interface on these series and rather contact ASUS to fix the missing sensor value in next BIOS version.