Flashback causes repeated Voxy renderer reloads and severe stutters

I'm experiencing a severe rendering issue when using Voxy together with Flashback.

While editing/playing back a Flashback recording, the terrain periodically disappears and then gets rendered again. At the same time, the game experiences very severe stutters/freezes.

This happens repeatedly during the same Flashback session. It does not look like normal chunk loading: according to the log, Voxy is actually shutting down its renderer and creating a new one repeatedly.

Environment

• Minecraft: 26.2
• Fabric
• Voxy: 0.2.18-beta
• Voxy Extra: 0.2.2
• Flashback: 0.43.1-for-MC26.1
• Sodium: 0.9.1+mc26.2
• Iris: 1.11.2+mc26.2
• Nvidium: 0.4.4-beta3-26.2
• GPU: NVIDIA GeForce GTX 1650

Other performance-related mods are installed, including C2ME, Lithium, ImmediatelyFast, ModernFix, EntityCulling, MoreCulling, FerriteCore, etc.

Voxy Extra configuration

My current Voxy Extra configuration has:

"flashbackIngest": true,
"flashbackCheckLodCache": true

Main Voxy issue

The main issue seems to be that Voxy repeatedly shuts down and recreates its renderer during Flashback playback/editing.

The log repeatedly shows:

Shutting down rendering
Shutting down render pipeline
Render shutdown completed
Creating Voxy render system

This causes the terrain to disappear temporarily and then be rebuilt, resulting in severe stutters/freezes.

I'm not sure what exactly triggers the renderer reload, but it appears to happen specifically while using Flashback with Voxy.

Logs

I'm also attaching my log, where the repeated Voxy renderer shutdown/recreation can be seen:

latest.log

Start with the attached latest.log and reproduce Flashback playback or editing with flashbackIngest and flashbackCheckLodCache enabled. Trace the repeated “Shutting down rendering” and “Creating Voxy render system” sequence to identify what triggers it. Done means the renderer no longer reloads repeatedly during the session and the associated terrain disappearance and severe stutters are resolved.