It's not a problem with converter. In all versions, default_tolerance_mode is an option also in config.pro and it also governs tolerance mode for parts' dimensions in 3D mode. Prior to Creo release this option had default setting to limits, thus all parts made in earlier software will have limit tolerance. Somewhere with Creo release it has been changed to nominal as default for new parts, but of course it hasn't affected models made with ProE.
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