Approximability of generalized free products of groups with amalgamated normal subgroup by some classes of finite groups

Let $G$ be a free product of almost soluble groups $A$ and $B$ of finite rank with amalgamated normal subgroup $H$, where $H\ne A$ and $H\ne B$, and let $\pi$ be a finite set of primes. We prove that $G$ is an almost residually finite $\pi$-group if and only if so are $A,B,A/H$, and $B/H$.