The DMG doesn't have additional rules for calculating the passive skill checks when you are using that variant dice rule.
This might be a bug or something missed by the community writers, since that rule doesn't show up in the SRD - it should be calculated by the program, but I don't think it knows how to add the Perception skill in as an integer, since part of the calculation for Perception now includes a string (1d6). The program is likely trying to add things together and breaks when it hits the d6.
Since Passives do not have a dice roll associated with them, it should show as 10+Wisdom Bonus + static Proficiency Bonus (which is +3 for a 5th level).
From the SRD:
Quote:
A passive check is a special kind of ability check that doesn't involve any die rolls. Such a check can represent the average result for a task done repeatedly, such as searching for secret doors over and over again, or can be used when the DM wants to secretly determine whether the characters succeed at something without rolling dice, such as noticing a hidden monster.
Here's how to determine a character's total for a passive check:
10 + all modifiers that normally apply to the check
If the character has advantage on the check, add 5. For disadvantage, subtract 5. The game refers to a passive check total as a score.
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