Hello, I believe I have found a possible Desync issue with the Incendiary Rocket ammo when using the Rocket Turret. Since the 17.26 update I have had multiple desync crashes in my multiplayer game. After removing the Incendiary Rocket ammo from the Rocket Turrets, I have had no issues. The Rocket Turrets still work fine with Rocket ammo. Thanks, and I love this mod.

When incendiary ammo was first introduced, it was not intended to use in mass. My motivation was to make napalm bomb (used like a lesser nuclear bomb) and incendiary rocket (act as smaller napalm bomb), so used as special AoE ammo rather than as main ammo. They are designed for manual firing only.
It is because in my testing (before release as public version), I have found too much ground flame stacked together will crash my singleplayer game (so it would be the same for multiplayer).
So when a player request them to be included as automatic weapon in gun pod / equipment form (see this request post), I have allowed such uses but gave a "warning" at the same time.
Still I suggest to use incendiary and napalm ammo only through manual fire, by tanks and rocket artillery.

But multiplayer desync caused by 0.17.26 update is a new issue to me.
Try using the save and play as singleplayer game.
If it happens too in singleplayer, then I can only suggest you not to use them in turrets. It is a game limitation on flame level that I can't fix.
If it is working in singleplayer, then it is a real mutliplayer desync issue. Please read this post, and submit a desync bug report here.

Thanks for the response. I can understand if its a game issue. I can try testing it in single player. I have been playing it for four hours now with no crashes so that is the issue. I will send a desync bug report after I test the single player. Thanks again!