Enabling Suricata IPS mode breaks OpenVPN IPv6

[athurdent]

My installation runs on a Proxmox KVM with VTXNET interfaces.

OpenVPN IPv6 connections work fine with Suricata disabled and also when it's enabled without IPS mode.
Enabling IPS mode results in:

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09:04:04.141495 IP6 (flowlabel 0x093d8, hlim 54, next-header TCP (6) payload length: 44) 2a02:***.57451 > 2a04:***.443: Flags [S], cksum 0xec4a (correct), seq 984059939, win 65535, options [mss 1380,nop,wscale 6,nop,nop,TS val 1291158504 ecr 0,sackOK,eol], length 0
09:04:05.146364 IP6 (flowlabel 0x093d8, hlim 54, next-header TCP (6) payload length: 44) 2a02:***.57451 > 2a04:***.443: Flags [S], cksum 0xe862 (correct), seq 984059939, win 65535, options [mss 1380,nop,wscale 6,nop,nop,TS val 1291159504 ecr 0,sackOK,eol], length 0
09:04:06.152410 IP6 (flowlabel 0x093d8, hlim 54, next-header TCP (6) payload length: 44) 2a02:***.57451 > 2a04:***.443: Flags [S], cksum 0xe479 (correct), seq 984059939, win 65535, options [mss 1380,nop,wscale 6,nop,nop,TS val 1291160505 ecr 0,sackOK,eol], length 0

My incoming firewall rules for port 443 IPv6 logs the connection as successful, IPS does not log any Alert when trying to connect.