It is a Sony T1 issue, sorry to diverge.
As you could see, the title is correctly using the diacritics, while the content isn't.
And T3 can do. I don't have a T2, but I assume it works as T1.
Other (non Sony) eReaders I tried have not this issue.
But the point is not to embed fonts, neither to switch manually the fonts in the Options menu - both methods that were used with all non-English characters. I uses so far another method, the on-board fonts, which has both the advantage of size and portability.
The point is how to use the diacritics that exist in the default font?
Since the fonts of T1 have a reduced size compared to those of 505 (for instance) I assume several groups have been removed from their definitions. However, T1 to T3 have additional fonts added, including the SYNMinIWA-Th which is the default font (collection) used in the dictionaries, which also appears to contain the required diacritics.
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