@dott-nagayama At this moment Japan East does not support version 2024-08-06 as listed in this table. What the above auto update means is that your current version gets updated to 2024-08-06 under the same Global Standard offering. The current offerings for PTU also does not have support for Japan East for this model version. So, this is an automatic upgrade that lets you use the latest features, you need not purchase additional PTU quota as the endpoint will still be global standard.
If you have additional questions specific to the deployment, you can always raise a support case from Azure Portal under Health + Support page. I hope this helps!!
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