Sav
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In 1.4.2, due to fixes for situations where objects pass through buggy passages, one-way portals started generating more frequently (I think this is because situations where underground gates don't fit occur more often, and therefore more monoliths are used). In the next version, this fix will be changed so that it doesn't significantly affect object generation.
In HotA, 12 two-way portals have been added, meaning there are a total of 20 – that's 4 more than all the monoliths (two-way portals + one-way portals) in SoD. Therefore, even in 1.4.2, one-way portals appear rarely, and in the next version, I think they shouldn't appear at all (except, of course, for specific cases, like 8xm12a without an underground area, where this isn't guaranteed).
In HotA, 12 two-way portals have been added, meaning there are a total of 20 – that's 4 more than all the monoliths (two-way portals + one-way portals) in SoD. Therefore, even in 1.4.2, one-way portals appear rarely, and in the next version, I think they shouldn't appear at all (except, of course, for specific cases, like 8xm12a without an underground area, where this isn't guaranteed).