The bug that was present in v1331 was supposedly fixed in https://support.studio-397.com/hc/en-us/articles/6253065920911-4-1-23-Hotfix However, the issue still persists in v1334, although the vibration magnitude is less than it was before the hotfix. I also causes severe protruding heat spots on the tyres, and very uneven wear which shows up in the tgm viewer. Most notable on the Mclaren MP4/8 front tyres, but it may occur on other tyres. The issue did not exist at all in v1225.
What sort of values? Recommendation is around or below 0.5: https://www.studio-397.com/2018/05/realtime-tyre-analysis-improvements-build-1110/
This is only occurring on one particular tyre as far as I know. The value changes whether the mass offset occurs in the central node (high value), or the outer nodes (low value) . Also a low value lessens the mass offset but does not get rid of it entirely.