If a pre-stress modal analysis contains a thermal condition load, then the results from R13 do not match that of R12.1.

This behavior in R13 is expected and in fact represents a better answer.

The help isn't perfect here since it mentioned pressure load stiffness but it appears the thermal load vector behaves the same.

"The effects of pressure load stiffness from a pre-stress analysis are evaluated at the analysis time at which the eigen analysis (modal or buckling) occurs. In previous releases, the effects of pressure load stiffness were based on the loading at time = 0."

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