Bug or intentional? Wrong unit production sounds

I’ve noticed some units do not play the right production sound. This list is not exhaustive, but here are what I found:

Regular unit with a native unit production sound:

Native unit with a regular unit production sound:
Sudanese dervish

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The Landwehr was confirmed as intentional

That’s weird because all other transformed regular units make the regular unit sound.

I think this one is intentional.