Mikrotik: VPN to the object, does not work out forwarding to the PPTP interface, who is to blame?

Question

VPN

The 750th Mikrotik is in stock. It is located with one tail in a partially isolated LAN (192.168.150.0/24), with the second - in a network where the Internet is available (10.10.5.0/24). The task is to wrap the traffic in such a way that all hosts from the /24 server are transparently available from the locale; access in the opposite direction at the initiative of clients from a remote network is not expected.
I didn't see Mikrotiks in my eyes (that's how it happened - we know, it's a shame), but the procedure in webfig was as follows:
0) PPP->Interface->Add->PPTP Client. We configure, connect, running - everything is fine.
1) Go to IP->Firewall->NAT, add two masquerading (Chain - srcnat, Src. address - one 192.168.150.0/24, the second 10.10.5.0/24, Out interface for both - our PPTP) . Separate rules for masquerading between the 10.10.5.0 and 192.168.150.0 subnets, as well as the route -- also exist.
2) IP->Routes->Add, add a route with Dst. address of the target network (let's say 10.21.0.0/24), our PPTP gateway, and a Unicast type
Traffic to any host on the remote 10.21.0.0 still tries to go over the internet when trying to ping or do anything else. Given my wildest lacunae in networking - what did I manage to miss? Logically, it should work.