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Bhava means birth, arising. While the aggregates are arising, born, they are being (Bhava) and being conditioned.
AN 3.47:1.6 SaṅkhataLakkhaṇaSutta:
“Mendicants, conditioned phenomena have these three characteristics.
What three?
Arising is evident, vanishing is evident, and change while persisting is evident.
These are the three characteristics of conditioned phenomena.”
So, "existence between death and rebirth" is "present being (present being birth and not death) of past death and future rebirth in succession".
Aggregates never stop to condition their effects. Even AsaññaSattaBhramma still be immagined by many real conditioner and conditioned. They have present 17 Rūpa which being conditioned by past Karmma and themselves.
So, there are nowhere "blank" or "special" between death and rebirth. There are only death and rebirth between death and rebirth.
Upvote:2
Most who are born in the human world will wait in a mind-made body waiting for a suitable place to be born. However it is not a birth or an existence.
You can learn more from this Noble Eight-Fold Path Meditation: https://youtu.be/vu0UZDb3gKk?list=PLk22Pmbx-cNPA_vMHe4G9LOZaPm8GGpM_&t=5790
However the goal here is to understand the suffering nature of bodily pain (i.e. the 'dukka' part in dukka, domanassa, soka, parideva)