In the show The Sandman, Ep7, a character speaks "machinations" with a soft /sh/, as "mash-in-ay-tions":
You seek to snare him in your machinations again?
I expected the "ch" to be pronounced with a hard /k/, and that seems to be the main transcription I find online.
But I also find references to a soft /sh/ like in "machine":
- /ˌma-kə-ˈnā-shən/ and /ˌma-shə-/ in Merriam Webster;
- UK /ˌmæʃ.ɪˈneɪ.ʃənz/ and /ˌmæk.ɪˈneɪ.ʃənz/ in Cambridge Dictionary
US /ˌmæʃ.əˈneɪ.ʃənz/ and /ˌmæk.əˈneɪ.ʃənz/ in Cambridge Dictionary
- /măk′ə-nā´shən/, /măsh′/- in American Heritage Dictionary.
I note that Cambridge Dictionary even has /sh/ before /k/, making it perhaps the main pronunciation.
I would like to understand this different pronunciation.
Is this soft /sh/ a common pronunciation?
Is it regional or related to specific dialects/accents?
Is it maybe just related to personal preference of the speaker?