The ubiquitous present participle passive in Mycenaean Linear B & in all subsequent ancient Greek dialects:

Here is a chart of attested (A) present participles passive in Mycenaean Greek found on Linear B tablets, and derived (D) present participles passive nowhere to be found extant in Mycenaean Greek:

present-participle-passive-in-mycenaean-linear-b-620

As anyone familiar with ancient Greek can attest to, the present participle passive was ubiquitous in Mycenaean Linear B and in all subsequent ancient Greek dialects. Since (a) students and researchers with ancient Greek understand the full functionality of the present participle passive and (b) since all others not familiar with any ancient Greek dialect do not understand how the present participle passive functions, I am not bothering to provide examples of its usage in any ancient Greek dialect... although perhaps I should.