Update to now released CB Conditionals 4.0.7 and see if your issue persists. Please note a tab condition counts as conditioning the field. So if you're conditioning the tab the field is on in addition to the field it self that maybe creating a conflict.
What do you mean by breaking registration process? You can't register at all or just those specifically conditioned fields do not store? Do other fields store fine? Have you tried enabling debug mode in CB Conditional > Parameters to help debug conditions? Any errors reported with debug mode and maximum error reporting enabled in Joomla global configuration?
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