Physical interpretation of the analytically continued charged solution

Determine the physical interpretation of the analytically continued Reissner–Nordström–Bertotti–Robinson–Bonnor–Melvin solution obtained by setting the Bertotti–Robinson parameter B to iB when the intrinsic monopolar charge e is nonzero.

Background

For vanishing intrinsic charge, the paper describes an analytic continuation B to iB that yields a real vacuum metric associated with a Schwarzschild black hole inside an expanding bubble of nothing. The authors then consider the charged case and find that the same continuation appears to produce complex metric and gauge-potential components.

Consequently, the physical meaning of this charged analytic continuation is left unresolved. The issue concerns the case e not equal to zero and is distinct from the uncharged continuation, whose interpretation is given.