Hi,
I took a look at this issue, and it seems like it is a bug. You should be able to edit those values in AC22 as well. I let the developers know, and they hope to fix this in an update (it will be in the release note as fix #262070).
Sorry about the inconvenience, I hope this doesn't hinder your project too much until the fix arrives.
Regards,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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