Yes, this is a quirk. The verb "быть" (был-есть-будет) requires instrumental for its direct object in all forms but Present tence.
Быть врачом.
Он был врачом.
Он (есть) врач.
Он будет врачом.
I don't know why it is so.
It is only for "быть", for example, equivalent verb "являться" requires Instrumental in all forms including Present.



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