When playing MDFC lands, Mythwweaver Poq's duplicate is always the front side
When playing the back-side of an MDFC, if the front side is a sorcery or an instant, the ability fizzles, while if the front side is a permanent like a creature, said front side goes on to the battlefield
I was going to check the rules, but as this is Arena only, it's not in the rules and thus I have no idea if this is the intentional behavior of the 'conjure a duplicate' mechanic or not
Examples:
I play a Cragcrown Pathway, Poq conjures a Cragcrown Pathway onto the battlefield
I play a Timbercrown Pathway, Poq conjures a Cragcrown Pathway onto the battlefield
I play a Turntimber, Serpentine Wood, Poq's ability triggers but does nothing
I play a Kazanadu Valley, Poq conjures a Kazanadu Mammoth onto the battlefield
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ilovebraisedmeats#57802 commented
I believe this is working as intended. MDFC's cannot be put onto the battlefield on their backside. You only get the backside if you opt to play it as a land as a land-drop from your hand (or graveyard, with something like Crucible of World). This is exactly why Uro doesn't let you put Serpentine Wood into play even if it's in your hand. MDFC's (the spell ones). And if an instant or sorcery would try to be put onto the battlefield for whatever reason, instead nothing happens. This rule already exists.
Since Alchemy is a miserable cluster**** and somehow no comprehensive rules exist, this is all my assumption. However, I'm inclined to believe this is the case based on how MDFC's work with cards that actually follow game rules.