Dispensers respect the hitboxes of fences and walls when using spawn eggs on top of them, but armor stands are placed inside and fall into them.
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The dispenser is not the issue, armor stand itself is the issue. Otherwise the mobs also would be spawned inside of the wall/fence. See MC-155992
NeunEinser
Thank you for your report!
However, this issue is a Duplicate of MC-65951.
That ticket has already been resolved, which means this won't be fixed.
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muzikbike