It is tangible and occupies its space. Even knowing it is an illusion only lets you see through it and have advantage on saves. It doesn't let you pass through the illusion or ignore it completely.
Basically, it is in a state where it is semi-ethereal and quasi-real, and the illusion is only to sell it being completely real.
Lore wise there used to be a branch of magic that worked by using shadow plane or ethereal plane matter to make illusion magic solid (which fun fact had a chance to become as good as real in those planes, and you lost control of the spell when the duration ended). This is a remnant of that.
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It is an illusion, but it specifically says it is 'tangible'.
It is tangible and occupies its space. Even knowing it is an illusion only lets you see through it and have advantage on saves. It doesn't let you pass through the illusion or ignore it completely.
Basically, it is in a state where it is semi-ethereal and quasi-real, and the illusion is only to sell it being completely real.
Lore wise there used to be a branch of magic that worked by using shadow plane or ethereal plane matter to make illusion magic solid (which fun fact had a chance to become as good as real in those planes, and you lost control of the spell when the duration ended). This is a remnant of that.