As you can see in Attachment 1, the water flow direction doesn't get blocked by structure void which breaks water transportation systems for players based on structure void blocks, but it works with signs just normally.
To reproduce the issue, just build a construction like in Attachment 1 with one using signs and one using structure void. Then observe the flow direction of the structure void one to be incorrect.
I also searched for issues that are possibly referencing this issue and have found nothing. If I did miss one, sorry 🙂
Attachment 1:
Attachments
Comments 2
Thank you for your report!
After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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Can confirm.