Mail-addresses from contacts are not taken over into 'send to' field

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Registration date
Sunday September 26, 2021
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Last seen
September 26, 2021
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Hello,
I recently encounter the following problem with Yahoo mail:
When starting a new mail, some mail addresses from existing Yahoo contacts are not taken over into the 'send to' field, even for contacts I've had for years. E.g., when I start to type 'John' in the 'send to' field, it will show a list of all 'Johns' I have in my contacts. However, when I type 'Paul', it won't show me any contact, although I have four 'PaULS' in my Yahoo contacts.
What could be the reason for this very annoying problem and how could it be resolved?
Thanks a lot in advance,
Thomas