In tonight's session, the party came across a Leomund's Tiny Hut. The party's bard chose to cast Dimension Door into it. This caused a bit of a (friendly) disagreement among the party, and none of us had an answer that solidly convinced the other side.
Leomund's Tiny Hut states:
Creatures and objects within the dome when you cast this spell can move through it freely. All other creatures and objects are barred from passing through it. Spells and other magical effects can't extend through the dome or be cast through it.
Dimension Door states:
You teleport yourself from your current location to any other spot within range. You arrive at exactly the spot desired. It can be a place you can see, one you can visualize, or one you can describe by stating distance and direction, such as “200 feet straight downward” or “upward to the northwest at a 45-degree angle, 300 feet.”
The disagreement stemmed from the use of the word through. Dimension Door doesn't launch anything or move the person through anything; you teleport, technically never crossing the barrier of Leomund's Tiny Hut. Instead, you completely bypass the Hut's walls and simply appear inside of it, and as a result it would not be blocked by Leomund's Tiny Hut's effects.
On the other hand, my interpretation is that Dimension Door is still extending through the Hut. You would need to be able to magically connect yourself from where you are to where you want to be, and that magical connection would be blocked by the Hut's barrier, causing the spell to fail.
None of us were able to find a solid answer, and after some google searching we could find nobody bringing up this circumstance.
Is it possible to cast Dimension Door through a Leomund's Tiny Hut, using the loophole that you technically never pass through the barrier?