Peer to peer intermittent: Still not getting site-to-site right

[DominikHoffmann]

I have a tun OpenVPN server at UDP Port 1194. I have three clients, each using Netgate 1100 appliances that use

192.168.4.6/29 = 192.168.4.00000110/255.255.255.248
192.168.4.14/29 = 192.168.4.00001110/255.255.255.248
192.168.4.22/29 = 192.168.4.00010110/255.255.255.248

with a remote network of 192.168.1.1/24 as defined in VPN → OpenVPN → Client Specific Overrides. The corresponding client configurations are

192.168.4.6/29 = 192.168.4.00000110/255.255.255.248
192.168.4.14/29 = 192.168.4.00001110/255.255.255.248
192.168.4.2/24 = 192.168.4.00000010/255.255.255.0

This in my understanding should not matter, as the client-specific overrides should, well, override those configurations. However, it appears to matter.

As can be seen here

only the first two connect. What’s more, I can only intermittently access them at their virtual addresses.

If anyone could shed light on this behavior, that would probably help me get the configuration right.