Is a Segwit format transaction with all inputs of non-witness program sort legitimate?

TL;DR: no, that won’t be accepted, however not due to something in BIP141. BIP141 specifies the…

bitcoin core – mandatory-script-verify-flag-failed (Script evaluated with out error however completed with a false/empty prime stack ingredient) on wrapped SegWit enter

my teammates and I at Ducat Protocol try to debug a transaction that spends a wrapped…