I have the excellent Neat Video Noise reduction FX Ver 5 and Ver 6 installed. I have one clip (4K XAVCS 25P) where a large red object is fizzing. Render this clip using the AV1 Vegas template using Ver 5 is OK, rendering Ver 6.0.5 crashes V23. Updating to Ver 6.0.7 seems to work OK at least on the clip I have. If you haven't tried Neat video for noise reduction (it is a paid FX) try the trial it is amazing. On another note the AV1 template is very flaky, very prone to crash if you change template settings and has no GPU option - please Magix take another look at it as AV1 is a fantastic render codec.