Does any faced the issue in interface when you use the typeOf() function against record in any interface or rule. In my case I have use a condition to check for particular record type against a list of variants. Its working fine during unit testing in interface level, but while opening that interface via portal link, data are not properly returned because of the invalid value returned in this function.
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I never tried that on a portal. Did you consider opening a support case?
Do you want to share what you are working on? Maybe there is an alternative approach.